| Code | Meaning | Description |
|---|---|---|
| (-) | Unknown Year | |
| [!] | Verified good dump | |
| (1) | Japanese/Korean | This applies only to Sega Genesis games. This denotes that the game will run on any Japanese or Korean system. |
| (4) | America/Brazil | This applies only to Sega Genesis games. This denotes that the game will run on any American or Brazilian system. |
| (5) | NTSC Only | This applies only to Sega Genesis games. |
| (8) | PAL Only | This applies only to Sega Genesis games. |
| [a] | Alternate | |
| (A) | Australian version | |
| (Adam) | ADAM version | This applies only to Coleco games. |
| [b] | Bad Dump | |
| (B) | Non-US | This applies only to Sega Genesis games. This denotes that the game will run on any non-US system. |
| [BF] | Bung Fix | This applies only to Nintendo GameBoy games. Bung released a programmable cartridge compatable with the GameBoy which could hold any data you wished to play. However, many games do not function on Bung v1.0 carts and have to be "fixed." |
| (BS) | Broadcast Satellaview | This applies only to Super Nintendo Entertainment System games. These Japanese ROMs were distributed through a satellite system in Japan known as the Broadcast Satellaview. They were transmitted along with a TV show which was connected to the game in some way. These games were only playable during the show, and thus stop after an hour, and many were timed so that only certain time periods were playable. |
| [c] | Faulty checksum | This applies only to Sega Genesis games. |
| (C) | Chinese version | |
| [C] | Color | Denotes GameBoy games that support color. |
| (E) | European version | |
| [f] | Fixed | A fixed game has been altered in some way so that it will run better on a copier or emulator. |
| (F) | French version | |
| (FN) | Finnish version | |
| (G) | German version | |
| (GR) | Greek version | |
| (H) | Dutch version | |
| [hFFE] | FFE Copier format | This applies only to Nintendo Entertainment System games. |
| (I) | Italian version | |
| (J) | Japanese version | |
| [h] | Hack | |
| (HK) | Cantonese version | |
| (K) | Korean version | |
| [M] | Mono Only | This applies only to NeoGeo Pocket games. |
| (M#) | Multilanguage | # represents number of languages |
| (NL) | Netherlandian version | |
| (NP) | Nintendo Power | This applies only to Super Nintendo Entertainment System games. Nintendo Power has been known to release games only available to its subscribers. Most of these ROMs are Japanese, as this practice occured mainly in Japan. |
| [o] | Overdump | An overdumped ROM image has more data than is actually in the cart. The extra information means nothing and is removed from the true image. |
| [p] | Pirate | |
| (PAL) | European version | This applies only to Atari games. |
| (PC10) | PlayChoice 10 | This applies only to Nintendo Entertainment System games. The PlayChoice 10 was an arcade unit which played exact copies of NES games in an arcade cabinet. The machines had choice of 10 games to choose from and ran for about 3 minutes on 25 cents. |
| (PD) | Public Domain | |
| (R) | Russian version | |
| (S) | Spanish version | |
| [S] | Super | This applies only to Nintendo GameBoy games. |
| (ST) | Sufami Turbo | This applies only to Super Nintendo Entertainment System games. The Sufami Turbo device allowed two GameBoy sized carts to be plugged into the SNES. Certain carts combined into new games much like the Sonic & Knuckles lock-on technology by Sega. |
| (SW) | Swedish version | |
| [t] | Trained | A trainer is special code which executes before the game is begun. It allows you to access cheats from a menu. |
| [T-] | Old translation | |
| [T+] | Newer translation | |
| (U) | American version | |
| (UK) | English version | |
| (Unk) | Unknown Country | |
| (Unl) | Unlicensed | |
| (VS) | Versus | This applies only to Nintendo Entertainment System games. The Versus system ran on similar hardware to the PC10 machines, but simply allowed you to play against each other. |
| [x] | Bad checksum | |