Ninety-nine diving suits
Press B, Left, Up, B at the title screen.
Ninety-nine portable holes
Press Right, Up, Select(2) at the title screen.
Ninety-nine smart bombs
Press X(2), Up, Down, X at the title screen.
Ninety-nine Nerf balls
Press B, A, Left(2) at the title screen.
Fifty lives
Press B, Up, B, Select, Y at the title screen.
Invincibility
Press X, A, B, Y, Up, Down at the title screen.
All levels completed
Press Up, A(3), Down at the title screen.
High jump
Press Up, Y(3), Down at the title screen.
Rubber floors in medieval levels
Press B, A, B, Y at the title screen.