Tiny Toon Adventures 2 (Gameboy)
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Expert Mode
At the Title screen, press A + Start.
Extra sport games
At the main screen select password and then enter four buster bunny heads. Youy will then be awarded with three sub-games.
Mini Games
Before the Konami Logo appears, hold A + B. Then, at the Press Start screen, press Start.
Options Screen
At the Title screen, press B + Start.