At the title screen, press L, Up, R, Down. If you entered the code correctly, a small green face will appear in the lower right corner of the screen. Select "Puzzle Mode", then choose the new "Another World" option. Alternatively, press A, Up, B, Down at the title screen.
Select "Puzzle Mode". Then at the puzzle selection screen, press Left(2), Up, Down, L, R, L, R, L + R. Now Bub, Bob, and the Boss characters may be selected.
At the game selection screen, press Z + L + R + A.
While playing the game, press Z + L + R + A.
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