Document:

<PAGE>

                                                                   Exhibit 10.18

                             SUPPLEMENTAL AGREEMENT

Party A: Actoz Soft Co., Ltd.
Party B: Shanghai Shanda Networking Development Co., Ltd.
Party C: Wemade Entertainment Co., Ltd.

         WHEREAS, Party A and Party B entered into a Software Licensing
Agreement (the "Original Agreement") on July 18, 2001, under which Party B was
granted an exclusive and legitimate license to operate Legend of Mir II ("LOM")
in Mainland China and the Hong Kong SAR, and the term of the agreement will
expire on September 28, 2003 (the "Termination Date").

         WHEREAS, in connection with the performance of the Original Agreement,
Party B had the right to receive certain technical support, and Party A wishes
to engage Party C, and Party C is willing to be engaged to perform the relevant
obligations in respect of the technical support. Party A and Party B agree to
accept Party C as co-licensor of LOM and Party C shall entrust Party A to
exercise all of its rights as co-licensor, and such entrustment shall be
irrevocable during the term of the Original Agreement and this Supplemental
Agreement.

         Party A and Party B hereby agree to enter into this Supplemental
Agreement with Party C:

1. The parties agree that the Final Notice given by Party A to Party B on July
9, 2002 shall cease to have any effect on any party from the date on which it
was given. Each of Party A, Party B and Party C agrees not to pursue any of the
other parties with respect to any conflict or dispute arising in the course of
previous cooperation among the parties.

2. Party A and Party C have developed an upgraded version of LOM known as
"Legend of Mir II, The Evil's Illusion" ("EI"), and Party A and Party C agree to
provide EI to Party B free of charge for Party B's exclusive operation in
Mainland China and the Hong Kong SAR no later than the end of January 2003.
Except for Party C's assumption of the obligation of technical support and the
circumstances provided for in Article 3 hereof, the rights and obligations of
the parties in connection with the operation of EI shall be subject to the
terms, wherever applicable, of the Original Agreement. Given the fact that Party
A and Party C have made substantial modification to EI, the parties agree that
EI shall be deemed as a follow-up version of LOM on and from the date of this
Supplemental Agreement and agree to rename EI as "Legend of Mir III: The Evil's
Illusion".

3. Upon the formal launch of commercial operation of EI, Party B shall timely
provide Party C with the Billing System and the password for the Login Server of
EI, and each time that Party B changes such password, Party B shall timely
provide Party C with the new password within three days. Party C shall give
prior notice to Party B each time it logs on to the said Server.

<PAGE>

4. To ensure the continued smooth cooperation among the parties to the operation
of the EI online game after the Termination Date, the parties agree that a
separate agreement shall be entered into prior to the provision of EI by the end
of January 2003 to set forth the detailed terms and conditions for Party B to
continue operation of EI. However, whether such agreement is concluded or not
shall not affect the ordinary performance of the Original Agreement and this
Supplemental Agreement.

5. Party B shall pay the Royalty Fee for the month of April to Party A by the
end of July pursuant to the Original Agreement, and pay the Royalty Fee for the
months of May and June to Party A by the end of August. Thereafter, the Royalty
Fee payable for each of the subsequent months shall be paid to Party A in
accordance with the Original Agreement, and Party B shall also use its best
efforts to provide Party A with sales information in relation to the Royalty Fee
in a manner required by Party A.

6. With respect to the technical problems that may affect the normal operation
of the game (including, but not limited to, cheating programs, accelerators, and
BUG, etc.), Party C undertakes to actively solve the same in accordance with the
Original Agreement and this Supplemental Agreement. The specific solutions are
as follows (the following solutions are also applicable to EI):

         6.1 Party C shall use its representative office in Shanghai as the
major channel for day-to-day technical communication with Party B in order to
obtain information in a timely fashion of any technical problems arising in the
operation of LOM;

6.2 In the event that Party B detects a technical problem in LOM, it may raise
such problem with the relevant personnel of Party C in its Shanghai
representative office, who shall in turn report the same to Party C. Party C
shall reply in writing regarding the specific schedule and feasibility for
solving the problem within 5 business days after receipt of the relevant report
on the technical problem. The time spent resolving the technical problem shall
not exceed 2 months. If a problem remains unsolved after 2 months, Party A and
Party C agree that Party B may temporarily withhold 10% of the Royalty Fee
payable for that period as the technical guarantee fee until the solution of
such technical problem.

         6.3 Party C undertakes to deal with all technical problems reported by
Party B prior to the conclusion of this Supplemental Agreement in accordance
with the preceding paragraph.

7. The parties hereby agree that they shall, within July 2002, make known to the
Chinese media and users of matters regarding Party B's exclusive operation of EI
products via press conference and other means.

8. The execution of this Supplemental Agreement shall not affect the validity of
any provision of the Original Agreement, and shall not affect the legitimate
entitlement to any right of any party to the Original Agreement.

                                       2

<PAGE>

9. This Supplemental Agreement is executed in six counterparts, and each party
shall hold two counterparts, each of which shall have equal effect.

10. This Supplemental Agreement is executed in Shanghai, China on July 14, 2002.

Party A: Actoz Soft Co., Ltd.
Authorized Representative: [signature]

Party B: Shanghai Shanda Networking Development Co., Ltd.
Authorized Representative: [signature]

Party C: Wemade Entertainment Co., Ltd.
Authorized Representative: [signature]

                                       3<PAGE>

                                                                   Exhibit 10.19

                            Duplicate of the Contract

                                                       No.

                                  Huarong Plaza

                          ---------------------------

                              House Lease Contract

                          ---------------------------

<PAGE>

                         HUARONG BUILDING LEASE CONTRACT

Lessor:  Shanghai Chengda Investment Development Co., Ltd. ("Party A")
Legal Address:  Huarong Plaza, No. 1271 to 1289, Pudong South Road Authorized
Representative: Tel: 58820088 Fax:

Lessee: Shanghai Shanda Networking Co., Ltd. ("Party B")
Legal Address:  M Floor, Puxiang Commercial Plaza, No. 1600 Century
         Road, Shanghai
Authorized Representative:
Tel: 58318669
Fax:

The Parties, pursuant to the provisions of the laws and regulations of the
People's Republic of China and the policies and rules of local government of
Shanghai, on the basis of free will, equality and mutual benefit, after
consulting with each other, hereby agrees to the following concerning the terms
and conditions of the lease of the office rooms in Huarong Plaza by Party A to
Party B:

ARTICLE I     LEGAL BASIS OF THE RIGHTS AND INTERESTS OF PARTY A

1.   Party A has acquired the land use right of Southeast B Pudong South Road
     and Zhangyang Road in Pudong New District , Shanghai, by means of land use
     right grant/allocate/transfer/ and has registered the land use right of
     such plot and obtained the Real Estate Certificate, the number of the
     certificate : Shanghai FangDiZi No.(2000)1000054, the area: 5733 sq.
     meters., use: business office

2.   Party A has been approved to invest and build Huarong Plaza (provisional
     name/present name) on the said plot of land. The construction structure of
     the main building is RC Frame and there will be 27 floors above the ground
     and 2 floors underground.

3.   Said commercial house has satisfied with the conditions of presale
     according to the provisions of the Shanghai Real Estate Transfer Regulation
     and the presale of such houses has been approved by Shanghai Administrative
     Bureau for House and Land Resources (the Number of the presale license:
     Shanghai FangDi No.(2000) WaiXiaoZi 852)

<PAGE>

ARTICLE II    INTENTION OF THE PARTIES

The parties to this agreement hereby acknowledge that Party A agrees to put out
to lease and Party B agrees to lease the houses as set forth in the following
provisions and both parties undertake to abide by the terms and conditions of
this contract.

ARTICLE III   LEASED HOUSE AND ITS AREA

1.   The house (referred to as "the House" hereafter) is located at Room
     2101-2113, and 2206-2211, on the 21st and 22nd Huarong Plaza, No. 1271 to
     1289, Pudong South Road in Pudong New District, Shanghai. (See Schedule II
     to this contract )

2.   The area of the house which is put out to lease by Party A and to be used
     by Party B is 2039.72 sq. meters. (The actual area shall be specified by
     Shanghai Surveying and Mapping Center for House and Land.) (See Schedule I
     to this contract.)

ARTICLE IV    USE

1.   The use of the houses leased by Party B shall be limited to office only.

2.   Party B shall not alter the use of the houses without previous permission
     of Party A in writing and approved by relevant authorities during the term
     of the lease contract.

ARTICLE V     TERM OF LEASE

1.   The term of the lease is Three (3) years, namely, from the 20th of May,
     2002 to the 19th of May, 2005.

2.   On the expiration of the lease contract, Party A shall have the right to
     take back all the leased houses, and Party B shall return such houses on
     time. If Party B requires to relet, it shall apply in writing within not
     less than Two(2) months before the expiration of the lease contract, and
     sign a new lease contract after the permission of Party A.

ARTICLE VI    THE RENTAL AND ITS PAYMENT

1.   The rental of the leased house is US$ 0.32 per sq. meters per day, and the
     total monthly rental is RMB 161,937.00 Yuan.

2.   The rentals shall remain the same in the first two (2) years. And since the
     third year, the rental shall increase by 3% per year.

3.   Party B shall settle the payments of the monthly rental before 20th of each
     month. And if Party B delays on the payment, it shall pay the overdue
     interests in an amount equal to 0.8% of the delinquent rental per day.

4.   The payments of the rental shall be done on the first working day of each
     month or before.

ARTICLE VII   OTHER EXPENSES

1.   During the term of the lease, no matter whether Party B actually uses the
     water and electricity, the expenses shall be calculated pursuant to the
     actual number indicated in the meters.

2.   The means and period of time of such payments: pre-pay in the beginning of
     each month and then settle at the end of each month.

3.   Late interests (omitted)

<PAGE>

4.   Application for the telephone (deleted)

ARTICLE VIII  DEPOSIT

1.   For the purpose of the performance of this contract, Party B shall at the
     execution of the contract pay deposit in an amount equal to the two-month
     rental, namely RMB323,874.00.

2.   There shall be no interests calculated to the deposit.

3.   Party B shall not use the said deposit to offset the rentals or any other
     expenses during the term of this contract.

4.   Party A shall return the deposit within one week on the expiration of this
     contract, after return of the house checked and accepted by Party A and
     balancing of the fees. If Party B either alters the structure of the house
     without the permission of Party A or fails to payoff the expenses timely,
     Party A shall have the right to either ask for compensation by Party B or
     deduct such amount of money directly from the deposit and then return the
     residual part of the deposit.

ARTICLE IX    LIABILITY TO REPAIR

1.   Party A shall make sure that the house could be safely used during the term
     of this contract. Party B shall take good care and make reasonable use of
     the houses leased and the facilities related to. Party B shall be
     responsible for the repairing or compensations for the damages caused to
     the houses and the facilities related to due to its misuse of the house.

2.   If Party B proposes to rebuild or alter the facilities of the house other
     than the present fitting-ups and facilities in the house, it shall be
     permitted by Party A in writing previously. Such rebuilding or alteration
     shall be operated after the completion of any application procedures which
     may be needed according to the provisions of the concerned authorities
     (including the real estate managing organs). Party B shall restitute the
     house to its previous status on the expiration of the lease contract if
     there is such requirement in the agreement in writing. Party B shall not
     damage the structure of the house when it back out the added facilities.
     The procedures of withdraw of the lease shall be started only after the
     approval of the check and accept.

3.   Party A shall be responsible for the repair of the house except as
     otherwise provided by the additional agreement of the parties to this
     contract.

4.   Party A shall notify Party B in writing Three (3) days ahead of time when
     doing any repair of building or any facilities to the house, and Party B
     shall cooperate and assist fully. Party B shall be responsible for the
     losses resulting from his interference with the repair by Party A.

5.   The Parties do not have to be responsible if there should be any damages to
     the house or losses to Party B due to any event of force majeure.

ARTICLE X     CONDITIONS FOR ALTERATION AND RESCINDING OF THE CONTRACT

1.   The contract shall not be altered or rescinded during the term of the lease
     unless in cases of the followings:

     1)  The parties agree after consulting with each other that in case of some
         special reasons that Party A may take back the house in advance or that
         Party B may withdraw the whole or part of the house in advance;

     2)  Party B breaches this contract and do not rectify within three (3) days
         after Party A has pointed it out;

     3)  The houses and the facilities related to are damaged due to force
         majeure, and therefore this contract could no longer be performed;

<PAGE>

2.   The party who requires altering or rescinding the contract should notify
     the other party when there is such alteration or rescission. The party
     shall be responsible for compensation if there are any losses caused to the
     other Party due to the alteration or rescission of this contract unless it
     could be exempted according to the 1.3 of Article X of this contract.

ARTICLE XI    LIABILITIES OF PARTY B

1.   Party A shall have the right to terminate this contract and take back the
     house if Party B behaves as the followings during the term of lease. In
     such cases, Party B shall also compensate for the losses caused to Party A
     if there is any:

     1)   Sublease, transfer, lend or exchange of the house without the written
          permission of Party A.

     2)   Alteration of the structure of the house or damages to the house
          without the permission in writing of Party A, and fail to rectify and
          remedy such alteration or damages in a period of time specified in the
          written notice by Party A.

     3)   Change of the use of the house without permission or make illegal use
          of the house;

     4)   Defaulting the rentals over two (2) months;

     5)   Other situations that Party A may be entitled to take back the house
          due to Party B's fault pursuant to the provisions of laws and
          regulations.

2.   Party B shall, if it delays on settle the fees for the water and
     electricity, pay the overdue interests in an amount equal to 0.5% of the
     said fees per day during the term of this contract. If the delay continues
     over one (1) month, Party A shall have the right to stop providing or
     allowing use of the water and electricity, and any results incurred hereby
     shall be borne by Party B.

3.   During the term of this contract, if Party B withdraws the lease halfway
     without the permission of Party A, such withdrawal shall be considered to
     be a material breach of the contract. Party A may deduct from the deposit
     and have the right to recourse otherwise if the deposit is not enough to
     compensate the losses and expenses.

4.   Party B shall return the house immediately on the expiration of the lease
     contract. If Party B delays on returning the house, it shall pay the
     liquidated damages in an amount equal to three (3) times as the delinquent
     rental per day.

ARTICLE XII       LIABILITY OF PARTY A

1.   If Party A fails to deliver the house to Party B for use on the date agreed
     in the contract, Party A shall pay liquidated damages in an amount of
     0.8% of the delinquent rental per day to Party B. And if the delay
     continues over thirty (30) days, Party A shall be considered to fail to
     perform this contract. Furthermore, if such liquidated damages are not
     enough to compensate the losses of Party B, Party A shall also compensate
     other losses additionally besides the said liquidated damages.

2.   Party A shall be responsible for the compensation of the property losses or
     personal damages caused to Party B as a result of the damages of the house
     due to Party A's failure of timely performance of the obligations of repair
     hereunder during the term of this contract.

3.   During the term of this contract, if Party A rescind the contract without
     permission in the cases other than those provided in the Article 1 of
     Article XI of this contract, and take back the house, it shall pay
     liquidated damages in an amount equal to three (3) times as the monthly
     rentals, and furthermore, if such liquidated damages are not enough to
     compensate the losses of Party B, Party A shall also compensate other
     losses additionally besides the said liquidated damages.

<PAGE>

4.   Party A shall be responsible for all the consequences if it fails to
     register this contract to the government authorities for administration of
     real estate transaction in accordance with relevant regulations after the
     execution of this contract by the parties.

ARTICLE XIII   OTHERS

1.   This contract will become effective after the registration and acquiring of
     House Leasing Certificate. Party A shall be responsible for handling the
     procedures of registration of alteration or termination within a period of
     fifteen (15) days after such alteration or termination on behalf of the
     parties, should there be any alteration or termination of this contract
     after the contract takes effect.

2.   The parties may sign supplementary clauses additionally after consulting
     with each other. However, the supplementary clauses shall be pursuant to
     the provisions of the house leasing regulations of the state and the local
     government. The supplementary clauses and schedules are an integral part of
     this contract. The contract and the supplementary clauses, as well as the
     words filled in the blanks in the Schedules to this contract and
     letterpress printing shall have the same effect.

3.   The parties are capable of civil acts and are clear to their respective
     rights, obligation and duties on the execution of this contract. The
     parties are willing to perform the contract strictly in accordance with the
     provisions of this contract. If one party breaches the contract, the other
     party shall have the right to claim for compensation in accordance with
     this contract.

4.   The parties shall try to settle through negotiations with each other any
     dispute arising out of the performance of this contract, or submit the
     dispute to Shanghai Arbitration Commission for arbitration if such
     negotiation fails.

5.   There are four counterparts for this contract (including schedules), among
     which, one each for Party A and Party B, one for Shanghai administrative
     authorities for real estate transaction and one for other relevant
     authorities. All the counterparts shall have the same legal effect.

<PAGE>

Party A:                                          Party B:

Legal Representatives:                            Legal Representatives

Signature:                                        Signature:

Date: 15th of April, 2002

Place:

<PAGE>

                              SUPPLEMENTARY CLAUSES

I.     The property management expenses for the real estate shall be US$ 3 per
       sq. meters per month (including the expenses for the central air
       conditioning). The central air conditioning is available twenty-four (24)
       hours per day for the whole year. (This clause applies to the 21st floor
       only.)

II.    Party A shall not refuse the fitting-up requirements put forward by Party
       B if such fitting-ups will not interfere with the safety of the structure
       of the house, the fire controlling or the lines layout.

III.   According to the provisions of Section 3 of Article XI, the maximum
       amount of compensation by Party B shall not exceed the amount of 3-month
       rentals (including the deducted deposit).

PARTY A                                           PARTY B

SEAL AND SIGNATURE                                SEAL AND SIGNATURE

<PAGE>

                          LEASED HOUSE DELIVERY LETTER

On the date of the fourth of June, 2002, the parties checked and accepted and
thereafter made delivery of the Room 2102-2113, and 2206-2211. Hereby the
parties make the following acknowledgements:

1.    The house leasing by Party A to Party B is Rooms 2101-2113 and 2206-2211.
      The actual area of the house is 2035.21 sq. meters as measured by Shanghai
      Surveying and Mapping Center for House and Land, which is recognized by
      Shanghai Administration Bureau for House and Land Resources. The number of
      the Real Estate Certificate of such newly constructed commercial houses:
      Shanghai FangDiShiZi No.(2002) 02467.

2.    The rental of the leased house is US$ 0.32 per sq. meters per day, and the
      total monthly rental is RMB 161,579.00 Yuan.

3.    This Delivery Letter shall come into effect on the execution of the
      parties.

PARTY A                                           PARTY B

SEAL AND SIGNATURE                                SEAL AND SIGNATURE

DATE:                                             DATED:

<PAGE>

         LIST of the CALCULATION OF THE CONSTRUCTION AREA OF EVERY HOUSE

Position:                                                      schedule 3 page 1

                             sq. meters     the received ratio of the room

<TABLE>
<CAPTION>
                                            THE BUILDING AREA    THE COEFFICIENT
          FLOOR              ROOM NUMBER       IN THE ROOM        OF APPORTION     COMMUNAL AREA   BUILDING AREA
------------------------     -----------    -----------------    ---------------   -------------   -------------
<S>                        <C>                 <C>                 <C>              <C>             <C>
The first floor
underground                    garage                                                                 2829.32
                           ----------------------------------                      -----------------------------
The second floor
underground                    garage                                                                 2542.46
                           ----------------------------------                      -----------------------------
            1                                     565.44           0.159780097         90.35           655.79
            2                                    2455.82                              392.39          2848.21
            3                                    2455.82                              392.39          2848.21
            4                                    2271.19                              362.89          2634.08
            5                                    2281.70                              364.57          2646.27
                                                --------                                             --------
                              subtotal          10029.97                                             11632.56
                           ----------------------------------                      -----------------------------
            6                                    1130.04           0.103983105        117.51          1247.55
            7                                    1238.78                              128.81          1367.59
            8                                    1253.02                              130.29          1383.31
            9                                    1253.02                              130.29          1383.31
         10 - 20                                 1253.02                              130.29          1383.31
           21                                    1252.48                              130.24          1382.72
           22                                    1252.36                              130.22          1382.58
           23                                    1250.66                              130.05          1380.71
           24                                    1247.03                              129.67          1367.70
           25                                    1238.78                              128.81          1367.59
           26                                    1111.26                              115.55          1226.81
           27                                    1111.26                              115.55          1226.81
                                                --------                                             --------
                              Subtotal          27121.91                                             29942.13
                           ----------------------------------                      -----------------------------
The second floor on the
roof                          Reservation                                                              749.50
                           ----------------------------------                      -----------------------------
The third floor on the
roof                          Reservation                                                              812.66
                           ----------------------------------                      -----------------------------
The fourth floor on the
roof                          Reservation                                                              797.93
                                                                                                     --------
                              Subtotal                                                                2360.09
                           ----------------------------------                      -----------------------------
          Total               House                                                                  49306.56
                                                                                                     --------
</TABLE>

Calculator:       Inspector:                                       Mar. 18, 2002

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