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Playstation - Williams Arcade's Greatest Hits cheats

Activate cheat menu
Choose any game. Hold L1 + L2 + R1 + R2 buttons and press Select 
before the game is started. Re-enter the code twice to unlock the 
"Operators Options Screen". Here you can adjust different options,
like the number of starting lives and the difficulty modes.

Secret Mortal Kombat 3 sounds
The game disc contains sounds from Mortal Kombat 3. Insert Williams 
Arcade's Greatest Hits game disc in to an audio CD player or use the 
PSX CD Player, then play track two.