Hidden Invasion

Easy mode

At the title screen, press Up, Down(2), Up, Left(2), Up, Right(2), Up(3). If you entered the code correctly, you will hear a sound.

Big heads and deformed bodies

At the title screen, press Left(2), Up(2), Right(2), Down(2). If you entered the code correctly, you will hear a sound. Start a game and all players and enemies will have big heads and deformed bodies.

Oogie Boogie mode

At the title screen, quickly rotate the Left Analog-stick counter-clockwise four times. If you entered the code correctly, you will hear a sound. Many objects will be bouncing during the game.

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Game Shark Codes

Master Code (Must Be On)	0E3C7DF2 1853E59E EE8C9146 BCC17EFA
Infinite Lives P1	FE994223 BCA99BE6
Infinite Lives P2	FE994433 BCA99BE6
Play as Same Characters (2 Player Mode)	DE80EB4A BCA99B84
Press Select for Extra Time	0E99D5F8 BCA99A81 DE80EF82 FE199B83
Quick Score	0E994202 BCD99BE6 CE994202 BCA99A82
Super Deformed People	CE80EB42 BCA99B84
Super Hero	DE80EB92 BCA99B84
Bouncy Stuff	CE80EB4E BCA99B84