Hardmode sans sheet by Kildare6 on DeviantArt

HARD-MODE] Insanity Sans Sprite Sheet v2 by slimdaddee on DeviantArt

Undertale:Hard Mode - Wonderful Idea sprites by NSEI1903 on DeviantArt

HARDMODE Sans concept by Addicted2Electronics on DeviantArt

Undertale Hard Mode Wonderful idea sans sprite by CoolDudepro on DeviantArt

Undertale Hard mode sans by Thdeathbones on DeviantArt

True Hardmode sans. [real] by Red8Bit on DeviantArt

Sans Hardmode by yoyoVo18372 on DeviantArt

Sans HardMode by CooLAndre on DeviantArt

Undertale Hard mode - Wonderful idea by Kekuusbroo on DeviantArt