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- Rule Systems
Rule System Directory
| Rule System (sort) | Publisher (sort) | Edition | Settings | Campaigns (sort) |
|---|---|---|---|---|
| 13th Age | Pelgrane Press Ltd | 1st | 0 | 14 |
| 13th Age | Pelgrane Press | 1st | 1 | 0 |
| 7th Sea | 1 | 7 | ||
| A Song of Ice and Fire Roleplaying | Green Ronin Publishing | 1st | 1 | 5 |
| Aces and Eights | 1 | 2 | ||
| Advanced Dungeons & Dragons | 1st | 5 | 57 | |
| Advanced Dungeons & Dragons | 2nd | 10 | 38 | |
| Advanced Dungeons & Dragons | 3rd | 1 | 0 | |
| Advanced Dungeons & Dragons | 3.5 | 1 | 9 | |
| Alpha Omega | Mindstorm Labs | 1st | 1 | 1 |
| Alternity | 1st | 2 | 1 | |
| Alternity | 1 | 2 | ||
| Anima | 1st | 1 | 29 | |
| Apocalypse World Engine | lumpley games | 1st | 4 | 14 |
| Ars Magica | Atlas Games | 5th | 1 | 5 |
| Artesia: Adventures in the Known World | Archaia Studios Press | 1st | 1 | 0 |
| BareBones Fantasy Role-playing Game | DwD Studios | 1st | 1 | 10 |
| Basic Fantasy Role-Playing Game | Chris Gonnerman | 2nd | 0 | 6 |
| Basic Roleplaying | Chaosium | 1st | 5 | 30 |
| Batman RPG | Mayfair Games | 1st | 1 | 2 |
| BattleTech | 1 | 1 | 1 | |
| BattleTech | 2 | 1 | 0 | |
| BattleTech | 3 | 1 | 0 | |
| BattleTech | 4 | 1 | 6 | |
| Beacon | Todd Mitchell | 5 | 0 | 1 |
