Sonic the Hedgehog 2 Classic Co-op
Sega Genesis / Mega Drive · cheat codes
Nightmare Circus cheats & codes
8 codes for Nightmare Circus on the Sega Genesis / Mega Drive, including Action Replay codes.
Nightmare Circus Action Replay codes
How to use: Datel's Action Replay sat between the console and the game. Enter codes on its menu before starting the game, or paste them into your emulator's cheat menu.
| Effect | Code |
|---|---|
| Infinite Health | FF6F46:25 |
Nightmare Circus Other codes
How to use: Additional codes collected by the community. Enter them through your emulator's cheat menu, choosing the format that matches your emulator.
| Effect | Code |
|---|---|
| Infinite Energy | AM3T-4A9A |
| Infinite Health | FF6F46:0025 |
| Debug Mode/Level Select Hold A+MODE Start On Screen Start Options | FF08BB:0001 |
| Invincibility/Untouchable Against Enemies. See Notes | R1YA-4602 |
| Enable Scene Selction in Tweaker menu | RHTT-E6V8 |
| Enable Operational Controls In Twearker Menu | RHTT-E6WT |
| Press Z for password | REWT-A6TA |
Using cheats today
Original cheat devices like the Game Genie, Action Replay and GameShark still turn up second-hand and work with original cartridges. Most modern emulators also have a built-in cheat menu that accepts these formats, so you can toggle codes on and off without extra hardware. Codes can differ between regional releases and revisions of a game; if one doesn't work, try the code list for another version.
Cheats can corrupt save files in rare cases, so back up your saves before experimenting.
Nightmare Circus walkthroughs & guides
More Genesis games with cheats
Sonic the Hedgehog 3 Classic
Sonic the Hedgehog Classic
Earthworm Jim Classic
Super Mario All-Stars Classic
World of Illusion Starring Mickey Mouse and Donald Duck Classic Co-op
Back to Nightmare Circus: is it worth playing?
Cheat codes are from the libretro-database community collection, used under CC BY-SA 4.0; the code tables on this page are shared under the same license. Codes are provided as-is: some may not work on every version of the game.