QuickLinks
 -- Click here to rapidly navigate through this document

 
 

Exhibit 4.3    
    


SUPPLEMENTAL INDENTURE  


        THIS SUPPLEMENTAL INDENTURE (the "Supplemental Indenture") is executed as of July 31, 2003, by the Additional Guarantor (as hereinafter defined) and Wells
Fargo Bank Minnesota, N.A., as Trustee (the "Trustee"). 


        WHEREAS,
MTR GAMING GROUP, INC., a Delaware corporation, as issuer (the "Issuer") and certain of its wholly-owned subsidiaries listed on Exhibit A attached hereto (the
"Existing Guarantors") have heretofore entered into an Indenture, dated as of March 25, 2003 (the "Original Indenture"), with the Trustee pursuant to which the Trustee acts as trustee for the
Holders of the Issuer's 9.75% Senior Notes due 2010; 


        WHEREAS,
pursuant to the terms of Article Ten of the Indenture, each Guarantor, by executing the Indenture, jointly and severally, unconditionally guarantees the Issuer's payment and
performance obligations under the Indenture; 


        WHEREAS,
in accordance with Article Ten of the Original Indenture, the Restricted Subsidiary listed on Exhibit B attached hereto (the "Additional Guarantor") must execute
supplements to the Original Indenture for the purpose of joining the Existing Guarantors as a Guarantor; 


        WHEREAS,
the Original Indenture permits the Additional Guarantor to execute supplements to the Original Indenture for the purpose of adding Guarantors; and 



        NOW
THEREFORE, in consideration of the agreements and obligations set forth herein and for other good and valuable consideration, the sufficiency of which is hereby acknowledged, the
parties hereto agree as follows: 


        Section 1.
Definitions. All capitalized terms used in this Supplemental Indenture not defined herein shall have the meanings
ascribed to them in the Original Indenture. 


        Section 2.
Additional Guarantor. The Additional Guarantor is hereby added as a Guarantor with all of the obligations of a Guarantor
as set forth in the Original Indenture, as amended and supplemented by this Supplemental Indenture. 



        Section 3.  Counterparts. This Supplemental Indenture may be executed in any number of counterparts, each of which shall be deemed
an original, but all of which together shall constitute one and the same document. 


        Section 4.
Governing Law. This Supplemental Indenture shall be governed by and construed in accordance with the laws of the State
of New York, without regard to the principles of conflicts of laws. 


[signature
pages follow] 






        IN
WITNESS WHEREOF, Scioto Downs, Inc. has caused this Supplemental Indenture to be duly executed all as of the date and year first above written. 



	 	 	 	 	SCIOTO DOWNS, INC.
	

 	
 	

By:	
 	

/s/  EDSON R. ARNEAULT      
	
 	

 
	 	 	Name:	 	Edson R. Arneault	 	 
	 	 	Title:	 	Chairman of the Board	 	 
	 	 	 	 	 	 	 
	

 	
 	

By:	
 	

/s/  JOHN W. BITTNER      
	
 	

 
	 	 	Name:	 	John W. Bittner	 	 
	 	 	Title:	 	Chief Financial Officer	 	 
	 	 	 	 	 	 	 





	This Supplemental Indenture is hereby

acknowledged and accepted this 6th day of

August, 2003 by WELLS FARGO BANK

MINNESOTA, N.A., as Trustee	 
	

By:	

/s/  JOSEPH P. O'DONNELL      
	

 
	 	Name:	Joseph P. O'Donnell	 
	 	Title:	Corporate Trust Officer	 
	 	 	 	 







EXHIBIT A  


Existing Guarantors


Mountaineer
Park, Inc. 


Presque
Isle Downs, Inc. 


Speakeasy
Gaming of Las Vegas, Inc. 


Speakeasy
Gaming of Reno, Inc. 


Racing
Acquisition, Inc.

(Merged into Scioto Downs, Inc.) 





EXHIBIT B  


Additional Guarantor


Scioto
Downs, Inc. 









QuickLinks



Exhibit 4.3