At the main menu, press Select, A, B, Left, Right, A, Select, Right.
Successfully complete all “A” levels in Puzzle mode. The code to Another Wold will appear after completing the final puzzle in level 5-A. Press A, Left, Right, A at the title screen to play as the Evil Sorcerer in Another World.
Bonus Puzzle sets
Get a high score for all the default puzzle sets to unlock the final four puzzle sets.
Successfully complete Puzzle Set Z then complete Puzzle Mode in DS Style to unlock Chakkun.