Dark World
Once you beat all the A worlds in the light world with DEV, enter at Title screen: A, Left, Right, A.
(Thanks to lost boid)

Sound Test
Enter at the main menu screen: Select, A, B, Left, Right, A, Select, Right.
(Thanks to lost boid)

Unlock the Evil Sorcerer
If you solve all 50 A puzzles, the game will give you the code to visit “Another World” and will unlock the evil sorcerer. In Puzzle Mode, Select 1-A, then 2-A, all the way to 5-A. After beating the last puzzle in 5-A, you’ll get the code and the end credits. After the DS restarts, you’ll be able to play as the Evil Sorcerer.
(Thanks to lost boid)

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