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This title is 8 ways, including regional variants, revisions and unofficial ones. Even under the same title, the contents differ by region and date.
| No | Year | Title | Maker | Notes |
|---|---|---|---|---|
| 1 | 1990 | Hammerin' Harry (World, M81 hardware) (original) | Irem | |
| 2 | 1990 | Daiku no Gensan (Japan, M72 hardware) | Irem | |
| 3 | 1990 | Daiku no Gensan (Japan, M82 hardware) | Irem | |
| 4 | 1990 | Daiku no Gensan (Japan, M84 hardware, set 1) | Irem | |
| 5 | 1990 | Daiku no Gensan (Japan, M84 hardware, set 2) | Irem | |
| 6 | 1990 | Hammerin' Harry (Playmark bootleg) | bootleg (Playmark) | not emulated |
| 7 | 1990 | Hammerin' Harry (US, M84 hardware) | Irem America | |
| 8 | 1990 | Hammerin' Harry (World, M84 hardware bootleg) | bootleg |
From this title you can move to the same year, the same maker, and the same board.