Successfully complete the indicated episode to unlock the corresponding floor in the Training Hall. To use the Training Hall, use the washbasin in Nameless Shrine.

Episode 2: Floor 1
Episode 2: Floor 2
Episode 3: Floor 3
Episode 4: Floor 4
Episode 5: Floor 5
Episode 7: Floor 6
Episode 9: Floor 8
Episode 10: Floor 9
Episode 12: Bottom floor