How to Unlock Rouge in Sonic Ultimate Flash

No cheat codes exist for Sonic Ultimate Flash. It's a fan-made Flash/HTML5 game (likely by DJV or similar) with no cheat engine support.

Legitimate Unlock (If Implemented)

• Complete Story/All Levels.
• Collect all Chaos Emeralds / Red Rings.
• Achieve S-Ranks on stages.
• Check the character select screen after credits – sometimes hidden chars appear there.

Modding (PC Browser / Downloaded .swf)

• Decompile .swf (JPEXS Free Flash Decompiler) → Edit unlock flags → Recompile. Technical, breaks easily.
• Search for "Sonic Ultimate Flash Rouge mod" on GameBanana / itch.io / Game Jolt.

Play Rouge in Official Games

• Sonic Heroes (Team Dark)
• Sonic the Hedgehog (2006)
• Sonic Generations (Mods / DLC)
• Sonic Frontiers (DLC / Mods)
• Sonic Riders series
• Super Smash Bros. Ultimate (Spirit / Mii Costume)

Fan Flash games are abandonware. Enjoy what's there; don't risk malware for a sprite swap.