Pixilart - Hardmode Sans by DaSpriteMaker08

Pixilart - Sans complete spritesheet by Epic-Artist

Pixilart - UF HARD MODE Sans by BLPR-iNK

Hard Mode Sans Sprites by ImXR24 on DeviantArt

Distrust:Difficult Mode-Sans phase 3 sprite sheet by Nerveabhorrence on DeviantArt

Insanitytale Hardmode Sans by Ninjamoves110 on DeviantArt

Pixilart - sans hard mode by dustsponge

Pixilart - hardmode sans by Apersonyoushoul

Pixilart - HardMode Sans by Tscale

Pixilart - sans hard mode no sheet by Tinkydiopsy-2