You cannot save inside except after boss rematches. You can start from floor 1, or after reaching them, from 101, 201, 301, 401, or 601.
Focus on 3-4 Damage Dealers and fill the rest with support to keep team HP/MP stable.
Once RP reaches 20,000, additional RP converts to UP, allowing you to buy rewards from the White Rabbit, such as Legendary Gear Gachas.
To reach high floors (600+) quickly for superior loot (level +31 to +33 gear), avoid non-mandatory battles.
Starting at floor 601 and rushing is the fastest way to cap your Resistance Power (RP).
A more difficult version unlocked by reaching Floor 600 in the regular Labyrinth, featuring superbosses every 5 floors. 2. Strategies and Tips