Omega Flowey Fight Simulator -2021- [upd] Official

The player controls a red heart in a bullet-hell arena. Each phase introduces new attack patterns. The 2021 simulator adds:

If you want to find the best version to play, I can help you search for the top-rated links. Share public link

Because the simulator was a browser-based HTML5 game, it remains accessible on most archive sites. As of 2025, you can find it on: Omega Flowey Fight Simulator -2021-

Green > Purple > Yellow > Red > Blue > Orange (easiest to lose).

Though it was just a fan project, the represents the best of the Undertale fandom: creative, obsessive, and slightly unhinged. It took a terrifying boss fight and turned it into a speedrunner’s playground and a casual killer of rainy afternoons. The player controls a red heart in a bullet-hell arena

The simulator serves as a time capsule. It preserves the feeling of being a 12-year-old, shaking at the keyboard, watching a flower turn into a Lovecraftian god. It allows veterans to revisit the fight without replaying the entire Neutral Route (which requires killing either Papyrus, Mettaton, or Toriel).

. This specific simulation captures the chaotic, fourth-wall-breaking nature of the battle that serves as the final boss of the game's Neutral Route The Simulation Experience Share public link Because the simulator was a

Mechanical pipes drop from the top of the screen, releasing explosive hazards. Weave horizontally between the falling ordinance.

The simulator focuses on replicating the "bullet-hell" chaos of the original encounter with several distinctive features: