i beat ALL bosses in ALL routes of UNDERTALE, UNDERTALE YELLOW, DELTATRAVELER, OVERTIME, TS!UNDERSWAP DEM0 2.0, DELTARUNE, and many more. and i can't. beat. Sansfield. (skill issue ik but still, just add an ez mode pls, lumpy-)
this one has a web browsee play https://gamejolt.com/games/Underfell-Mettaton/853341