If you're unfamiliar with Japanese characters, consult a hiragana chart while entering a password. Enter any of the following passwords after selecting the middle option (password) on the main menu.

Effect	Password
Level 2	a sa tsu ki
Level 3	hi me mo mo
Level 4	wa ta nu ki
Level 5	u tsu se mi
Level 6	ka ta shi ro
Level 7	u ma o I
Level 8	se ki re I
Level 9	ya ya sa mu