Sonic in Undertale Spritesheet by Ninjacat025 on DeviantArt

Sonic & Knuckles Sprite Sheets – Sega Genesis - Sonic Galaxy.net

PC / Computer - Sonic Mania - General Objects - The Spriters Resource

PC / Computer - Sonic Mania - Text - The Spriters Resource

Custom / Edited - Sonic the Hedgehog Customs - Dr. Eggman (Chibi, Sonic Mania-Style) - The Spriters Resource

PC / Computer - Sonic Mania - Sonic the Hedgehog - The Models Resource

Sonic Mania - Special Stages, Bonus Stages, & Time Attack Shown Off, Page 16

Custom / Edited - Sonic the Hedgehog Customs - Big Arm (Sonic Mania-Style) - The Spriters Resource

Custom / Edited - Sonic the Hedgehog Customs - Mighty (Sonic Mania-Style) - The Spriters Resource

Sonic Mania Items Objects Misc Sprites by Alex13Art on DeviantArt

Sonic Mania - Hyper Sonic by RedDaDoucheHog on DeviantArt