How to Use Cheat Codes on NES Emulators (RetroArch, Mesen, FCEUX, Nestopia)

Built-In Cheat Menus (Easiest)

• RetroArch: Quick Menu (F1) → Cheats → Load Cheat File (.cht) → Toggle codes. Download .cht packs from libretro/cheats.
• Mesen / Mesen-S: Tools → Cheats → Add Game Genie / Pro Action Replay / Raw hex. Real-time search supported.
• FCEUX: Debug → Cheat Search / Cheat List → Add Game Genie / PAR / .cht file.
• Nestopia UE: Options → Cheats → Add .cht or manual entry.

Cheat Formats

• Game Genie (GG): 6-8 char alphanumeric (e.g., SXIOPO). Encrypted address+value.
• Pro Action Replay (PAR): 8-digit hex address : 2-digit hex value (00E0F0:09).
• Raw RAM: Direct poke (emulator-specific).

Step-by-Step (Generic)

1. Find codes for your **exact ROM version/region** (GameFAQs, GameHacking.org).
2. Load ROM in emulator.
3. Open Cheat menu → Add code → Enable.
4. Save state (F5) before activating—some crash the game.

Caveats

• Codes are **region-specific** (U, E, J, P).
• Bad codes = glitched graphics, freezes, corrupted saves.
• Online multiplayer (Netplay) — disable cheats or desync occurs.