Madagascar

All power-ups:
While playing a game, press X, A(2), X, Y, L, B, R, L.

Bird Flying arcade mini-game:
While playing on level 3, go in the right subway entrance.
You will find the arcade games.

Easy coins:
Get 30 coins, then enter to the Zoovenir Shop. Buy the Coin Magnet, which will
magnet the coins to you.

In Stage 3 with Gloria, hit 30 cars to get 15 coins.

Unverified cheats:
Stage select:
While playing a game, press R, R, X, L, L, A, Y, R, Y

Invincibility:
While playing a game, press Up, Down, A, A, R, L, R, L, Y, B, X