Sakura Taisen

Level select:
Select one player mode.
Highlight the "Puzzle" option on the rule menu.
Hold Right + R + Z and press A to select levels 1 to 50.
Hold Right + R + X and press A at the level selection screen to select levels 51 to 90.

Hidden characters:
Hold L + Z at the main menu and press C to select the type of game.
The three daughters of the Imperial Theater Company and Fujieda Ayame will appear on the character selection screen.

Play as Yoneda Ikki:
Hold R + X at the main menu and press C to select the type of game.
He will be the only selectable character.