Boxxle

If you enter this password, you will be able to select from any of the puzzles on the last stage. All of them will appear to be completed. Complete any one of them and you will see the ending.

2 D[Spade]XX
3 G[Spade]XY
4 H[Spade]XZ
5 J[Spade]X!
6 K[Spade]X?
7 L[Spade]X0
8 M[Spade]X1
9 N[Spade]X2
10 P[Spade]X3
11 Q[Spade]HT

At the Title screen, hold A + B + Up until the credits appear.