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You Must Click the Play button within Player to Start the Game. Usual Control Keys for Such Games are Z, X, C, Enter Keys, Arrow Keys.
Rayman Raving Rabbids (Rising Sun)
In the Rayman Raving Rabbids game, Press Z to select language and press Enter key to start the game. Use arrow keys to scroll to options and press Z to select the option. Once the game start, you can move with Arrow Keys, Jump with Z key, and attack with X key.