Select the "Cheat Entry" option at the main menu. Then, enter one of the following codes to activate the corresponding cheat function.

Extra reward coins
Press Down(2), B(2), Down, Left, Up, Right, A at the "Cheat Entry" screen.

DoodleBob Drawing
Press A, B(2), Y, X, R, L, X, Up, Left, Right at the "Cheat Entry" screen. This option allows you to draw DoodleBob.

Gary Drawing
Press Y, X, Up, Down, A, B, Right(2) at the "Cheat Entry" screen. This option allows you to draw Gary.

Patrick Drawing
Press B, X, Y(2), A(3), R, L, Down at the "Cheat Entry" screen. This option allows you to draw Patrick.