Pain.

[https://www.roblox.com/games/5308219973/pain#! Pain] is a Roblox game that is very similar to A Really Fricking Big House, however it is a lot harder and a lot more RNG-Based. Pain ends at Room 1001 and the player starts at Room 1. Unlike A Really Fricking Big House, Pain does not have checkpoints, Monster introductory Rooms, the Save room with ARFBH fanart and some of the room textures in the main game. This is most likely due to the fact that it does not get updated often. Pain is like an old version of the main game. The monster's have their old designs, some rooms such as the longest room do not appear in the game, their is no beginning and ending dialogue and Killer does not appear in the game. The player will always start off with a pickaxe so that they can break Golem's walls. Any monsters can appear at any room excluding room 1, safe rooms and the end room. Multiple monsters can chase the player at once and the same monster can spawn twice, thrice, etc. The limit of how many monsters can chase you at once is unknown, it could be 30 or there could be no limit.

Pain also has 4 monsters that do not appear in the main game : Boss, Alice, Cringe and Schoolgirl / Yandere. These monsters do not really oppose a threat to the player, especially Cringe. Boss and Schoolgirl / Yandere, however, can be a bit annoying with certain monsters. All monster's mechanics act similarly to the main game's normal mode. The only difference is that Golem dashes and Banshee appears at the entrance and gets into the player's vision in a really short amount of time. Parasite also gets a nerf, as it is now a little slower than the player's walking speed.

Respawn rooms ( rooms where you would usually save ) appears every 250 rooms. And, as the name suggests, every player who died will respawn. Safe rooms with the posters appear at random and players will not respawn in those rooms. Pain does not have a hard mode.