Bubsy 2

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.