Puzzle Challenge: Codes New Options
In the options, hold select and press the A button. Seven new options will appear beneath the Gallery option.

Super-Hard Difficulty
Go to the 1 Player mode and choose Challenge. Highlight the Hard difficulty level and hold the Select button. While holding it, press A. S-Hard will appear beneath the Easy option.

Intense Difficulty
Go to the 1 Player mode and choose Challenge. Highlight the S-Hard difficulty level and hold the Select button. While holding it, press A. Intense will appear beneath the Normal option.