How Iizuka feels about Hyper Sonic : r/SonicTheHedgehog

Base Sonic speed Downgrade

The History of Sonic the Hedgehog: The Modern Era - LevelSkip

Sonic The Hedgehog Heroes Sonic The Hedgehog / Sandbox - TV Tropes

Sonic The Hedgehog: Most Up-to-Date Encyclopedia, News & Reviews

Sonic 4: Episode 2 in 2012, Episode 3 Unlikely - Sonic Retro

Sonic The Hedgehog Compilations - Every Sonic Collection Before Sonic Origins

StarBlog: Sonic the Hedgehog CD (PC) Review

Sonic Superstars - Nack-oto Ohsima - Discussion - rllmuk

Sonic Adventure - Wikipedia

Sonic R - Desciclopédia

Sonic Frontiers' Sole Playable Character Is Sonic; Takashi Iizuka Briefly Comments On Projects Post-Frontiers - Noisy Pixel