Level Skip
Pause game play, then press L(2), R(2), Down(2).

No Timer
Pause game play, then press L, R, Left(2), Up(2).

Kingsize Power-Ups
Pause game play, then press Right(3), Left(3), R, L.

Level Passwords

Level   Password  
1       Wakko, Wakko, Wakko, Wakko, Wakko  
2       Dot, Yakko, Brain, Wakko, Pinky  
3       Yakko, Dot, Wakko, Wakko, Brain  
4       Pinky, Yakko, Yakko, Dot, Brain  
5       Pinky, Pinky, Yakko, Wakko, Wakko  
6       Brain, Dot, Brain, Pinky, Yakko  
7       Brain, Pinky, Wakko, Pinky, Brain  
8       Brain Pinky, Pinky, Wakko, Wakko  
9       Dot, Dot, Yakko, Pinky, Wakko  
10      Brain, Dot, Brain, Yakko, Wakko  
11      Akko, Yakko, Pinky, Dot, Dot  
12      Pinky, Pinky, Brain, Dot, Wakko  
13      Yakko, Wakko, Pinky, Wakko, Brain  
14      Pinky, Wakko, Brain, Wakko, Yakko  
15      Dot, Pinky, Wakko, Wakko, Yakko