| opwolf | | Operation Wolf (World, rev 2, set 1) | Taito Corporation Japan | 1987 |
| opwolf3 | | Operation Wolf 3 (World) | Taito Corporation Japan | 1994 |
| opwolf3j | opwolf3 | Operation Wolf 3 (Japan) | Taito Corporation | 1994 |
| opwolf3u | opwolf3 | Operation Wolf 3 (US) | Taito America Corporation | 1994 |
| opwolfa | opwolf | Operation Wolf (World, rev 2, set 2) | Taito Corporation Japan | 1987 |
| opwolfb | opwolf | Operation Bear (bootleg of Operation Wolf) | bootleg (Bear Corporation Korea) | 1987 |
| opwolfj | opwolf | Operation Wolf (Japan, rev 2) | Taito Corporation | 1987 |
| opwolfjsc | opwolf | Operation Wolf (Japan, SC) | Taito Corporation | 1987 |
| opwolfp | opwolf | Operation Wolf (Japan, prototype) | Taito Corporation | 1987 |
| opwolfu | opwolf | Operation Wolf (US, rev 2) | Taito America Corporation | 1987 |
