Cheat mode:
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At the main menu, select "Options", "Cheat Codes", then enter one of the
following case-sensitive codes to activate the corresponding cheat function.
Note: Some European and Australian versions of the game do not have the "Cheat
Codes" option.

Kelly Kelly's second costume:
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Enter "KellyKG12R" as a case-sensitive code to unlock Kelly Kelly's second
costume.

Triple H and HBK's DX attire:
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Enter "DXCostume69K2" as a case-sensitive code to unlock Triple H and HBK's DX
attire.