Successfully complete the game. Continue with a new session with the cleared saved game file. Complete the second Varl Mountain event to enter a bonus dungeon.
Extra dungeon
Clear the game once and continue the new game+ file. Clear the second Varl Mountain event to access the extra dungeon.
Hard mode
Clear all stages once.
New game +
Beat the game once and start again on the same file.
New game ++
Finish the game in New Game + to unlock New Game ++.