10 Best Multi-Phase Video Game Boss Fights Ever
4. Photoshop Flowey - Undertale
Final bosses don't come much more creative or unhinged than Photoshop Flowey (aka Omega Flowey) at the end of Undertale's neutral route.
This heavily segmented battle reveals Flowey's final form after he absorbs the six human SOULs, transforming into a nauseating, skin-crawling fusion of flower, human, and machine.
The ensuing fight is heavily segmented, alternating between fighting Flowey and reclaiming each of the six SOULs through an array of totally insane bullet hell sequences.
Once you have the SOULs, you'll be able to whittle Flowey's giant health bar down, though upon doing so, he'll simply reload a previous save file, call you an idiot, and restart the fight with a full health bar.
Thankfully, though, the SOULs will step in and help defeat Flowey once and for all.
Between the frequently fourth wall-breaking visuals and insane musical score, this is a sensory assault of a final boss fight beyond any and all compare.