Sonic CD (GameCube / Gems Collection): No Debug Mode

The GameCube version of Sonic CD (included in Sonic Gems Collection) does not have an accessible Debug Mode or object placement feature in the retail release.

Why Debug Mode Is Absent

• Port Basis: Gems Collection ports are based on the **PC (DirectX) / Sega CD** codebase, stripped of development tools.
• No Level Editor: Unlike Sonic 2 (Simon Wai prototype) or Sonic 3 & Knuckles (Mushroom Valley debug), Sonic CD never had a widely leaked dev build with functional debug menu on retail hardware.
• Action Replay / Gecko Codes: Some codes exist for **Invincibility, Level Select, All Time Stones**, but no "Place Object" / "Debug Mode" code has been documented for the GCN version.

Debug Mode in Other Versions

• Sega CD (Prototype 510 / 712 / 0.51 / 0.62a): Early dev builds have Debug Mode (Press A+B+C+Start on Title → Sound Test → Level Select → Debug). Not in final retail.
• PC (1996) / PC (2011 Remaster): No debug mode accessible.
• 2011 Remaster (Mobile/Console/PC - Taxman/Stealth): Debug Menu exists! Enable via `settings.ini` (`DebugMode=true`) or specific button combo (varies by port). Allows Object Placement, Collision View, Level Select, Time Warp. This is the only official version with functional debug tools.

Recommendation

If you need Debug Mode for Sonic CD, use the **2011 Remaster (Steam / Mobile / Console)**. It is the definitive version (widescreen, 60fps, Tails playable, debug tools). The GameCube Gems Collection version is a historical curiosity only.