Pain

Pain Mode is an extremely harder version of Rfbh, more than one monster can spawn per room with no limit, the further you go more the monsters, this means you can have 5 Golems chasing you or even worse cases. Monsters will despawn after 40 rooms and also can spawn at any room even room 2

pain has additional enemies and also uses old models of the monsters from regular rbfh

pain has has save rooms every 250 rooms but the game can't actually be saved it will just respawn all players

also there are some "break rooms" they are rooms with a bed a desk with a computer and a table and a poster saying i am going to win, every monster will despawn when entering one of these, the chance of this room spawning is completely random meaning you could get these consecutive times.