Pause the game, then hold Z and press B, C Left, C Up, C Right, C Down, B, A, C Left, C Left
Baseball leaves a smoking trail
Pause the game, then hold Z and press C Left, A, C Right, C Down, B, A, C Left, C Left
Big Baseball
At the Title Screen press R, A, Z, R, C-Right, A, B
Credits Option
Pause the game, then hold Z and press C-up, C-right, A, C-right, A, C-down, C-down, C-up, C-up, C-down.
Players Are Paper-Thin
Pause the game, then hold Z and press C Up, C Right, A, C Left, C Left, B, C Up, C Left, C Left
Players' heads, feet, hands and bats are big
Pause the game, then hold Z and press C Left, C Left, C Right, C Up, B, C Right
Some players are fat, others are thin