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Press X, Left, Right, Left, X at the title screen. Now you will be able to access more puzzles in the puzzle mode.
Extra characters
Press Right, Right, X, Left, Left, at the title screen.
New option:
Press Up, X, Down, X, Up, at the title screen.
New option 2:
First enable the "Extra characters" and "New option" codes. Then, at the title screen press X, Up, Left, Down, Right, Up, X, Down, Left, Up, Right, Down + X.