At the title screen, hold Down + A, then press Start. A new tileset with only four tiles will be used.
Start a new "SOLITAIRE MODE" game. Click on the "HELP2" button, then click on the "RETRY" option. Hover your cursor over the "OK" option, hold Down + B on Controller 2, then press A on Controller 1. After restarting, the puzzle will be automatically solved and you can see the corresponding ending picture.
At the title screen hold Right on Controller 1, then press A, Start, B, Select, A. Press A to cycle through all of the game ending screens. Hold Select and then press A to see the credits.