Document:

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                                                                    EXHIBIT 10.6

                        THIRD AMENDMENT TO USE AGREEMENT

         THIS THIRD AMENDMENT TO USE AGREEMENT (hereinafter called the "Third
Amendment"), made and entered into this 27th day of June, 2002, by and between
Bayfront Park Management Trust, a limited agency and instrumentality of the City
of Miami (the Trust), and Concorde Cruises, Inc. , a South Dakota corporation
authorized to do business in the State of Florida, and the
successor-in-interest, by operation of law, of Bayfront Ventures (hereinafter
called the "User").

         WHEREAS, on June 19, 1997 the Board of Trustees of the Trust adopted a
Resolution relating to the Trust's favorable determination to approve the
transfer of the interest of Leo Equity Group, Inc., in User to Concord Gaming
Corporation, which interest was subsequently transferred by Concorde Gaming
Corporation to Concorde Cruises Inc. on July 6, 1998 and approved by the Trust
by Transfer, Assumption and Consent to Transfer of Use Agreement dated March 28,
2000; and

         WHEREAS, on June 25, 1997 the Trust executed a Use Agreement (the "Use
Agreement") which was approved by the City of Miami Commission, the U.S. Army
Corps of Engineers and the Oversight Committee established by the Governor of
the State of Florida; with Bayfront Ventures, a Florida joint venture consisting
of Leo Group, Inc. and Goldcoast Entertainment Cruises, Inc.; and

         WHEREAS, on September 26, 1997 the Trust and User executed an Amendment
To Use Agreement which, among other things, changed the Commencement Date of the
Use Agreement to 12:01 A.M. on October 1, 1997; and

         WHEREAS, on March 31, 2000 Concorde Cruises Inc. purchased all of the
interest owned by Gold Coast Entertainment Cruises Inc. in and to the general
partnership called Bayfront Ventures, which partnership, by operation of law,
was dissolved upon Concorde Cruises acquiring 100% of the interests in said
partnership; and

         WHEREAS, on or about September 2001 the Trust and User executed an
undated document entitled "Amendment No. 2 to Use Agreement Between Bayfront
Park Management Trust and Bayfront Ventures" identified in City of Miami
Resolution No. 01-879 passed and adopted September 13, 2001 which amended
certain provisions of the Use Agreement relating to fueling and to charitable
cruises; and

         WHEREAS, the Trust and the User wish to further modify and amend the
Use Agreement as hereinafter set forth (as used in this Third Amendment the
terms "Use Agreement", and "Agreement" may be used interchangeably and shall
mean the Use Agreement dated June 25, 1997 and all subsequent amendments and
modifications thereto, including this Third Amendment. The term "Amended
Agreements" shall mean shall the Use Agreement and all amendments thereto and
the Valet Parking Concession Agreement described in Section 2 herein, and all
amendments thereto).

                                                                               1
<PAGE>

         NOW, THEREFORE, in consideration of the premises, and for other good
and valuable consideration, the receipt and sufficiency of which is hereby
acknowledged, the parties agree to be legally bound, and hereby agree as
follows:

         1. The above recitals are true and correct and are hereby incorporated
and referenced as if fully set forth herein. Unless otherwise indicated, all
capitalized terms used in this Third Amendment shall have the respective
meanings given them in the Use Agreement, as amended.

         2. The Use Agreement is amended in the following respects:

A. Section 2, entitled "Facility" shall be amended by deleting subsection (b) in
its entirety and by adding the following at the end of the section:

         "Trust agrees that the dock space situated in the southerly portion of
the Park, as shown in the Site Plan, shall not be used for gaming purposes so
long as the User is not in default of any of the terms of the Use Agreement, as
amended, or of the Valet Parking Concession Agreement between the Trust and
Bayfront Valet, L.C., dated December 8, 1998, as amended, or of the Guaranty."

B.  Section 3, entitled "Term", is hereby amended as follows:

Sub-section 3(b) shall be amended by adding the following at the end of the
sub-section:

         "Notwithstanding the deadline for User's exercise of the Extension
Option contained herein, User hereby elects to extend the Term for one (1)
additional five (5) year term (the "Extension Term") and the Trust hereby
accepts such extension."

C.  Section 4, entitled "Fees; Letter of Credit", is hereby amended as follows:

1. Sub-section 4(a) is hereby deleted in its entirety and shall now read as
follows:

                  a.  For the Initial Term, User shall pay the Trust fees (the
"Fees") for the use of the Facility in the following annual amounts:

<Table>
<Caption>
Contract         Use Fee -          Use Fee -      Advertising       Total
  Year           North Dock        South Dock          Fee         Annual Fee
--------         ----------        ----------      -----------     ----------
<S>              <C>               <C>             <C>             <C>
1                 $350,000          $25,000          $25,000       $  400,000
2                 $400,000          $25,000          $25,000       $  450,000
3                 $400,000          $25,000          $25,000       $  450,000
4                 $425,000          $25,000          $25,000       $  475,000
5                 $425,000          $25,000          $25,000       $  475,000

Total                                                              $2,250,000
</Table>

                                                                               2
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User shall pay One Hundred Fifty Thousand Dollars ($150,000.00) (the "Initial
Payment") on the date of the approval of this Agreement (the "Approval Date") by
(i) the U.S. Army Corps of Engineers, (ii) the Miami City Commission and (iii)
the Oversight Committee established by the Governor of the State of Florida. One
Hundred Thousand Dollars ($100,000.00) of the Initial Payment shall be applied
to the annual fees for the first year of the Initial Term. The remaining Fifty
Thousand Dollars ($50,000.00) is in consideration for the deferral of the
Commencement Date to September 1,1997, as provided in paragraph 3(a). Except for
the Initial Payment, User shall pay the annual fees in twelve (12) equal monthly
payments of Thirty-Nine Thousand Five Hundred Eighty-Three Dollars And
Thirty-Three Cents ($39,583.33). On each anniversary of the Commencement Date,
User shall pay to the Trust the amount of $158,333.32, reflecting payment for
the first month (October) and payment for the last three months (July, August
and September) of the new Contract Year. User shall receive a credit for the
last three months' payment of said Contract Year. In the event User desires to
use more than Twenty-Five Thousand Dollars ($25,000.00) of annual advertising,
User shall pay for the additional advertising at the Trust's prevailing rates.

2. Sub-section 4(b) is hereby deleted in its entirety and all references to the
Letter of Credit contained in the Agreement are hereby voided and rendered
inoperable. Sub-section 4(b) shall now read as follows:

                  b. "Attached hereto and incorporated by reference in this
Agreement is a Guaranty of same date executed by Concorde Gaming Corporation, a
corporation existing under the laws of the State of Colorado, in favor of the
Trust and of the City of Miami wherein Concorde Gaming Corporation guarantees
the performance and payment obligations of User (the "Guaranty"). Upon the
expiration or other termination of each of the Amended Agreements, as defined in
the Guaranty, and the payment in full and performance in full of all
Indebtedness (as defined in the Guaranty) of User to Trust, Trust shall sign a
release."

3. Sub-section 4(c) is hereby deleted in its entirety and shall now read as
follows:

                  c. "Commencing October 1, 2003 and continuing throughout the
remainder of the Extension Term, the annual Fees shall be increased annually,
effective on the first day of each Contract Year, by an amount equal to two
percent (2%) of the Fees payable during the preceding Contract Year. For the
Additional Term the annual Fees shall be increased annually, effective on the
first day of the first Contract Year of the Additional Term, by an amount equal
to four percent (4%) over the Fees during the last year of the Extension Term,
and on the first day of each subsequent Contract Year of the Additional Term, by
an amount equal to four percent (4%) over the Fees during the preceding Contract
Year of the Additional Term."

D. Section 6, entitled "Security Deposit" is hereby amended so that the sentence
which reads "The Security Deposit shall secure only the non-monetary Events of
Default" is hereby deleted and shall now read as follows:

         "The Security Deposit shall secure both monetary and non-monetary
Events of Default."

                                                                               3
<PAGE>

E. Section 17, entitled "Approval of Vessels" is hereby deleted in its entirety
and shall now read as follows:

         "The Trust shall have the right to approve the vessels docked by User
at the North Dock, which approval, so long as the vessel does not exceed 260
feet in length, shall not be unreasonably withheld or delayed. The Trust
confirms it has approved the "Bayfront Princess," a 230-foot yacht. User shall
have only the right to operate one gaming vessel from the North Dock. User shall
not be prohibited from docking other non-gaming vessels from the North Dock as
long as they do not dock there overnight."

F. Section 26, entitled "Utilities" is hereby amended by adding the following at
the end of the section:

         "In the event the User establishes a shore-power electric connection to
         provide electrical service to the Facility, the reasonable cost of the
         connection shall be credited to the monthly payments due from User
         under Section 4 above. Said credit shall be amortized over the 60
         months contained within the Extension Term described in Section 3 (b)
         above, but shall not be refunded to User in the event of a default or
         earlier termination of the Use Agreement, as amended. User shall pay
         for all electric power consumed by User."

G. Section 32, entitled "Termination Rights" is hereby deleted in its entirety
and shall now read as follows:

         32. Termination of Rights.

                  a. User shall have the right to terminate the Use Agreement,
as amended, on thirty (30) days' written notice to the Trust if, because of
governmental action, User is not legally permitted to operate an offshore gaming
vessel. If, because of governmental action, casino gaming becomes legal in the
State of Florida and User's passenger count declines to less than eighty percent
(80%) of the passenger count in the prior Contract Year, User shall have the
right to negotiate a just termination fee for the right to terminate the Use
Agreement, as amended, which termination fee will not be less than one year's
fees. User's obligation to pay any termination fee so agreed upon shall be
secured by the Guaranty.

         b. Early Termination Procedure

                           (1) Provided that User is not in default under the
terms of the Amended Agreements, as defined in the Guaranty (hereinafter
defined), User may at any time terminate the Use Agreement, as amended, by
giving written notice of not less than twenty-four (24) months (such period, the
"Notice Period") to Trust of User's intent to terminate the Use Agreement, as
amended, and vacate the Facility. Notwithstanding User's termination of the Use
Agreement, as amended, pursuant to this Section 32(b), User may, at User's sole
option, continue to occupy the Facility for a period (the "Post-Notification Use
Period") not to exceed eighteen (18) months from User's written notification to
Trust of its election to terminate, during which Post-Notification Use Period
User shall continue to make monthly payments to Trust

                                                                               4
<PAGE>

pursuant to the terms and conditions hereof, as such monthly payments come due,
and shall continue to comply with all non-monetary obligations.

                           (2) Upon User's vacating the Facility after a
termination pursuant to this Section 32 (b) whether such vacating occurs (i)
immediately, (ii) at some point prior to the running of the Post-Notification
Use Period, or (iii) upon the running of the Post-Notification Use Period, then,
throughout the remainder of the Notice Period, User shall continue to make
monthly payments to Trust pursuant to the terms and conditions hereof, as such
monthly payments come due, but shall have no other obligation hereunder, of any
kind whatsoever, with respect to the Facility, except that User shall complete
repairs, replacement and/or maintenance of any portion of the Facility
commenced, or becoming due under the terms of the Use Agreement, as amended,
prior to User's vacating the Facility.

                           (3) In the event that User terminates the Use
Agreement, as amended, pursuant to this Section 32 (b), User's maximum liability
to Trust under the terms of the Use Agreement, as amended, shall be an amount
not greater than the sum of (i) all payments remaining due under this Third
Amendment and the Use Agreement, as amended, for the duration of the Notice
Period; (ii) any accrued but unpaid sums owed by User to Trust with respect to
payments already due; (iii) full compliance by User of all non-monetary
obligations while User is in possession of the Facility, and (iv) upon User's
vacating the Facility, the value of any repairs, replacements and/or maintenance
to the Facility commenced and not completed, or becoming due under the terms of
the Use Agreement, as amended, prior to User's vacating the Facility.

H. Section 35 entitled "Notices" is hereby amended to provide notices to the
following individuals:

                        As to User:

                        Concorde Cruises, Inc., a South Dakota corporation
                        c/o Mr. Jerry Baum
                        3290 Lien Street
                        Rapid City, South Dakota 57702

                        With a copy to:

                        Lucia A. Dougherty, Esq.
                        Greenberg Traurig
                        1221 Brickell Avenue, 22nd Floor
                        Miami, Florida 33131

                        As to the Trust:

                        Mr. Timothy F. Schmand
                        Interim Executive Director
                        301 North Biscayne Boulevard
                        Miami, Florida 33132

                                                                               5
<PAGE>

                        With a copy to:

                        Mr. Carlos Jimenez, City Manager
                        City of Miami
                        444 S.W. 2 Avenue
                        10th Floor
                        Miami, Florida 33130

I. The amendments contained herein shall apply and take effect retroactively to
October 1, 2001.

J. Except as specifically provided herein, all of the terms and provisions of
the Use Agreement, as amended, shall remain in effect.

                                    USER

                                    Concorde Cruises, Inc., a South Dakota
                                    corporation, authorized to do business in
                                    the State of Florida

                                    By /s/ Jerry Baum
                                       -----------------------------------------
                                       Jerry Baum, President

SECRETARY

--------------------------------
Printed Name:

WITNESSES:

/s/ Mary A. Stadel
--------------------------------
Printed Name:  Mary A. Stadel
              ------------------

/s/ Linda L. Gibbs
--------------------------------
Printed Name:  Linda L. Gibbs
              ------------------
                                    TRUST

ATTEST:                             Bayfront Park Management Trust, a limited
                                    agency and instrumentality of the City of
                                    Miami, by and through its Board of Directors

/s/ CM Maen                         By: /s/ Timothy Schmand
--------------------------------        ----------------------------------------
                                        Timothy Schmand, Interim Director

                                    this 27th day of June, 2002

                                                                               6
<PAGE>

APPROVAL OF THE CITY OF MIAMI

                                           THE CITY OF MIAMI,
                                           A municipal corporation of the
                                           State of Florida,
Witnesses:

/s/ GM Maen                                By: /s/ Carlos Gimenez
----------------------------------------      ----------------------------------
Printed Name:  GM Maen                        Carlos Gimenez, City Manager
              --------------------------

/s/ Simon Feeco
----------------------------------------
Printed Name:  Simon Feeco
              --------------------------

ATTEST:

By:  /s/ Priscilla A. Thompson
    ------------------------------------
    Priscilla A. Thompson, City Clerk

APPROVED AS TO INSURANCE                   APPROVED AS TO FORM AND
REQUIREMENTS:                              CORRECTNESS:

By: /s/ Sue Weller                         By: /s/ Alejandro Vilarello
    ------------------------------------      ----------------------------------
    Sue Weller,                               Alejandro Vilarello, City Attorney
    Acting Risk Management Administrator
    Department of General Services
    Administration

                                                                               7<PAGE>
                                                                   EXHIBIT 10.27

                                    GUARANTY

FOR VALUABLE CONSIDERATION, Concorde Gaming Corporation, a Colorado corporation,
("Guarantor") hereby unconditionally guarantees to Bayfront Park Management
Trust, a limited agency and instrumentality of the City of Miami ("Trust"), and
to the City of Miami, a municipal corporation of the State of Florida ("City"),
the full and prompt performance and full and prompt payment of any and all
obligations and indebtedness, whether monetary or non-monetary in nature, of
Concorde Cruises, Inc., successor by operation of law to Bayfront Ventures, a
Florida general partnership (collectively referred to herein as "User"), under
the Use Agreement dated June 25, 1997, as amended by the Amendment to Use
Agreement dated September 26, 1997, the Second Amendment to Use Agreement dated
September, 2001, and the Third Amendment to Use Agreement dated June 27, 2002
(collectively, the "Use Agreement"), and under the Valet Parking Concession
Agreement dated December 8, 1998, as amended by the Amendment to Valet Parking
Concession Agreement dated June 27, 2002 (together, the "Parking Agreement", and
collectively with the Use Agreement, as each may be further amended from time to
time, the "Amended Agreements"). (Copies of the Amended Agreements are attached
hereto as Exhibit A.).

The word "Indebtedness" is used herein in its most comprehensive sense and
includes any and all debts, obligations and liabilities of User to City and/or
Trust arising from the Amended Agreements, whether heretofore, now, or hereafter
made, incurred, or created, whether monetary or non-monetary in nature, and
however arising, whether due or not, absolute or contingent, liquidated or
nonliquidated, and whether User may be liable individually, or jointly with
others, or whether recovery upon such Indebtedness may be or hereafter becomes
barred by any statute of limitations, or whether such Indebtedness may be or
hereafter becomes otherwise unenforceable, and is not limited as to amount or
type, except that Guarantor's liability for monetary obligations shall be
limited to an amount not greater than the sum of the monthly payments due under
the Amended Agreements during a period of Twenty-Four (24) months and
Guarantor's liability for non-monetary obligations shall be limited to those
corresponding to the actual term of the Amended Agreements. In the event
Guarantor elects to terminate the Amended Agreements pursuant to the Early
Termination Procedure contained therein, Guarantor's monetary liability at any
given time during the Notice Period (as defined in the Amended Agreements) shall
be decreased by an amount equal to the total monies actually paid by Guarantor
from the start of the Notice Period through such time.

Guarantor's obligations under this Guaranty (the "Guaranty Obligations") are
independent of the obligations of User. A separate action or actions may be
brought and prosecuted against Guarantor, whether or not action is brought
against User, and User may be joined in any such action or actions. This
Guaranty is a guaranty of payment and not of collection.

Guarantor acknowledges and agrees with Trust and City that each Indebtedness is
a valid and binding obligation of User. Guarantor authorizes Trust and City,
without notice to or demand upon Guarantor, from time to time, and on any number
of occasions, to (a)

<PAGE>

renew, amend, compromise, extend, accelerate, reinstate, or otherwise change the
time for payment of the Indebtedness or (b) otherwise change the terms of the
Indebtedness or Guaranty Obligations

Guarantor waives any right to require Trust and City to (a) proceed against
User; (b) proceed against or exhaust any security held from User; or (c) pursue
any other remedy whatsoever available to Trust and City. Guarantor waives any
defense arising by reason of any disability or other defense of User or by
reason of the cessation from any cause whatsoever of User's liability. Guarantor
waives any right to enforce any remedy that Trust or City now has or may
hereafter have against User. Guarantor waives all presentments, demands for
performance, notices of nonperformance, protests, notices of dishonor, and
notices of acceptance of this Guaranty and of the existence, creation or
incurrence of new or additional indebtedness and all other defenses to any
action or proceeding to enforce this Guaranty, except the two defenses of actual
payment and actual performance in accordance with the Amended Agreements.

No delay on the part of Trust or of City in the exercise of any right, power or
privilege under the terms of any documentation between (a) Trust and/or City and
(b) User, or under this Guaranty, shall operate as a waiver of any such
privilege, power or right.

Upon default of User on any of its Indebtedness to Trust and City, or if User or
Guarantor shall become insolvent or make an assignment for the benefit of
creditors, or if a petition in bankruptcy or for corporate reorganization or for
an arrangement be filed by or against User or Guarantor (and, in the case of an
involuntary proceeding, not dismissed within sixty (60) days of its listing), or
if there is the appointment of a receiver for User or Guarantor or for their
property, or if a judgment is obtained or warrant of attachment issued against
User or Guarantor, and the same is not bonded off within fifteen (15) days from
entry thereof, then all of the Indebtedness, shall, without notice or demand, at
the option of Trust and City, become immediately due and payable and shall be
paid forthwith by Guarantor.

Guarantor hereby submits to the jurisdiction of the state and federal courts in
the State of Florida for purposes of any action arising from or growing out of
this Guaranty, and further agrees that the venue of any such action shall be
laid in Miami-Dade County.

Guarantor acknowledges that the Trust and the City have been induced by this
Guaranty to re-negotiate the terms of the Amended Agreements with User, and that
Trust and City would not have agreed to such re-negotiation without this
Guaranty.

Guarantor acknowledges and agrees that this Guaranty shall remain in full force
and effect until the expiration or other termination of each of the Amended
Agreements, and until such time as all Indebtedness of User to Trust and City is
paid and/or performed in full.

Guarantor shall furnish to Trust and City, within ninety-five (95) days after
the close of its fiscal year a copy of its Annual Report on Form 10-K containing
the balance sheet of

<PAGE>

Guarantor as of the close of such fiscal year and statements of income,
stockholder's equity and cash flows for the year then ended and the opinion
thereon by Guarantor's independent public or certified public accountants.
Financial statements of Guarantor must be prepared in accordance with generally
accepted accounting principles. Each provision hereof is intended to be
severable and the invalidity or illegality of any portion of this Guaranty shall
not affect the validity or legality of the remainder hereof.

GUARANTOR HEREBY VOLUNTARILY, KNOWINGLY AND INTENTIONALLY WAIVES ANY AND ALL
RIGHTS TO TRIAL BY JURY IN ANY LEGAL ACTION OR PROCEEDING ARISING UNDER THIS
GUARANTY OR CONCERNING THE INDEBTEDNESS AND/OR ANY COLLATERAL THEREFOR OR
PERTAINING TO ANY TRANSACTION RELATED TO OR CONTEMPLATED THEREBY, REGARDLESS OF
WHETHER SUCH ACTION OR PROCEEDING CONCERNS ANY CONTRACTUAL OR TORTIOUS OR OTHER
CLAIM.

Any notice or demand given or made under this Guaranty shall be given or made by
mailing the same by registered or certified mail to the party to whom the notice
or demand is given or made at the address of such party set forth below, or such
other address as such party may hereafter designate by notice given as provided
in this paragraph.

                             As to Guarantor:
                             Concord Cruises, Inc., a South Dakota corporation
                             c/o Mr. Jerry Baum
                             3290 Lien Street
                             Rapid City, South Dakota 57702

                             With a copy to:
                             Lucia A. Dougherty, Esq.
                             Greenberg Traurig
                             1221 Brickell Avenue, 22nd Floor
                             Miami, Florida 33131

                             As to Trust:
                             Mr. Timothy F. Schmand
                             Interim Executive Director
                             301 North Biscayne Boulevard
                             Miami, Florida 33132

                             With a copy to:
                             Mr. Carlos Jimenez, City Manager
                             City of Miami
                             444 S.W. 2 Avenue
                             10th Floor
                             Miami, Florida 33130
<PAGE>

This Guaranty may be executed in any number of counterparts, each of which shall
be deemed an original, but all of which together shall constitute but one
instrument.

IN WITNESS WHEREOF, Guarantor has executed this Guaranty on the date set forth
below the signature line, to be effective on the date of the Third Amendment to
the Use Agreement and the Amendment to the Valet Parking Concession Agreement.

                                            GUARANTOR:

                                            CONCORDE GAMING CORPORATION

                                            By: /s/ Jerry L. Baum
                                                -----------------
                                            Print Name: Jerry L. Baum
                                            Title:  President

Executed on June 27, 2002

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