This isn't an official Roblox game (it's a user-generated experience, often using a "script" or being a full-fledged game). It throws you into a massive crossover where you play as various versions of Sans, Papyrus, Gaster, and other Undertale characters from countless alternate universes (Underswap, Underfell, Dusttale, Horror, Fresh, etc.). The "Multiverse Timeline" part means you battle through different story arcs and against ridiculously overpowered "final boss" versions of characters.
The game features a massive roster with many characters having multiple phases or rework versions: Classic & AU Favorites (Classic, Fell, Swap, Epic), (Disbelief, TS Underswap), and (Glitchtale, Neutral) The Murder Time Trio Horror Sans Powerful Entities Fatal Error Betty Noire How to Use Scripts (Codes) "Scripts" in the context of UCMT often refer to Redeemable Codes Undertale Crazy Multiverse Timeline Script Roblox
: High-tier characters often require massive amounts of currency, such as W.D Gaster Rework (20,000 Souls) or Asriel Rework (9,000 Cores). Active & Historical Codes This isn't an official Roblox game (it's a
Which of those would you like next?