Duck Hunt Classic
Sega Master System · cheat codes
Mercs cheats & codes
18 codes for Mercs on the Sega Master System, including Action Replay codes.
Mercs 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 "Nuke" Blasts | 00D3-9C09 |
| Infinite Health | 00D3-B21F |
| Infinite Time | 00D0-9101 |
| Have Full Power Rifle | 00D0-A203
00D0-A303
00D0-A603 |
| Have Flamethrower | 00D0-A204
00D0-A301
00D0-A501
00D0-A602 |
| Have Rocket Launcher | 00D0-A206
00D0-A304
00D0-A502
00D0-A603 |
| Have Spread Gun | 00D0-A207
00D0-A302
00D0-A503
00D0-A603 |
| First Boss Cannot Shoot | 00D2-0E00 |
Mercs 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 Health | 00D3-B21F |
| Infinite Time | 00D0-9101 |
| Have Full Power Rifle | 00D0-A203
00D0-A303
00D0-A603 |
| Have Flamethrower | 00D0-A204
00D0-A301
00D0-A501
00D0-A602 |
| Have Rocket Launcher | 00D0-A206
00D0-A304
00D0-A502
00D0-A603 |
| Have Spread Gun | 00D0-A207
00D0-A302
00D0-A503
00D0-A603 |
| First Boss Cannot Shoot | 00D2-0E00 |
| Invincibility | C9D-B74-2A2 |
| Health Auto Replenish | 00DC-C901 |
| Infinite "Nuke" Blasts | 00D3-9C09 |
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.
More Master System games with cheats
Back to Mercs: 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.