Multiplayer is a modifier added in the April Fools update. As the name suggests, you will be able to play with 3 bots disguised as people with fake usernames (4 "players" in total including yourself).
Icon in menu
Behavior[]
Choosing Multiplayer will spawn up to 3 more bot players. There are also more enemies, usually 5 instead of the regular 1-2, randomly chosen from all stages, resulting in huge, chaotic fights.
Your allies choose a random upgrade with each passing level, including in Endless Timeless.
Bosses have 100% more HP in Multiplayer. When a boss spawns, they also spawn 4 randomized "enemy players". They use hosts and act identical to your allies, and are hostile to your team.
If an ally dies, they will be gone until the next level. If you die but there are still allied bots on the map, you will become an invisible ghost and will be able to witness the continuing battle. This is intentional, and will end when either all enemies are killed, in which the game progresses onto the next stage, or when all allies are dead, in which the game ends. The player can also quit to the menu to end the battle.
Notes[]
- Multiplayer stacks with Swarm, resulting in a lot of enemies spawning on the stage at once.
- Beating the game with Multiplayer enabled unlocks Tear.
- Secret hosts, although they will occasionally spawn as players, are rarer than normal hosts.
- Usernames are randomly chosen from existing Roblox users. This is not subject to Roblox's filtering, thus it is possible to have bots with inappropriate usernames appear.
- During the fight with Resident Mind, your allies (and enemy bots) will not spawn until the battle with your clone begins.
- Resident Mind spawns when your clone dies, even when the other enemy clones are still alive. For this reason it is recommended to finish off all other clones before going for your own clone.
- Killing Resident Mind still allows you to exit and win the game even with the enemy Hosts alive, unlike the other boss stages. Thus, you can focus on your clone & Resident Mind for a possibly faster run.
- Another thing to note is that all the clones spawn in the center of the stage. This information can be used to setup a huge barrage of attacks against the clones, using AoE moves like Subject's lightning potions.
- If the player is killed and an ally deals the finishing blow to Resident Mind, the game will continue on as normal, however, the player can freely roam the city after walking off the end of the path as the game does not warp the player back to the arena as one would expect.
- Falling off the edge of the map in this stage completely breaks the game, requiring the player to re-join the game to continue playing.
- The bots cannot use tempos. Therefore you can see how this isn't real multiplayer.
- Allied multiplayer bots have a hidden damage multiplier that reduces the damage taken when they are low on health. The damage indicator still indicates that they received full damage, however.
Tips[]
- Perhaps one of the most powerful Hosts here is
Dreamer, as he has Signature Move and as mentioned before with Overclocked 
Zero you can shred all enemies. 
Parting with The Drifter's Burden & The Prophet's Crown can tank almost any hit at max combo, & dish out damage en masse with The Dreamer's Nightmare.
