To erase a saved game file, highlight the file you wish to delete and hold Select, press A + B.
Once you beat the puzzles in the Ultra puzzle mode you will see what looks like a final puzzle. When you select this final item you are taken to the game's title screen. Now you can select any of the 12 EX puzzles that border the screen.
After you beat all 13 (be sure to play the puzzle in the middle of the screen) of Mario's EX Mode Puzzles, this mode opens up.
Beat Wario's Special puzzles to unlock the Ultra puzzle difficulty. (It is not yet clear whether or not you need to beat Mario's Special puzzles first as well to unlock this new mode.)
To unlock extra normal levels, do this:
Effect - Code
Mario 5, 6, 7 - Complete Mario's 1st 4 Levels.
Mario 8, 9, 10 - Complete Mario's 5th, 6th, and 7th Levels.
Wario 5, 6, 7 - Complete Wario's 1st 4 Levels.
Wario 8, 9, 10 - Complete Wario's 5th, 6th, and 7th Levels.
Wario's Super Picross (Wario 1, 2, 3, 4) - Complete Mario's 1st Level.
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