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| Title | Players | Minimum Age | Game Duration (mins) | Play Online? | Buy on Amazon? | |
|---|---|---|---|---|---|---|
 Oops My Bad |
2 to 12 | 18+ | 20 to 60 | |||
 Oort: Treasure Hunting in the Farthest Reaches of Space |
2 to 4 | 8+ | 10 to 20 | |||
 Opacity |
3 to 6 | 8+ | 10 to 20 | |||
| Opale |
2 to 2 | 8+ | 20 to 20 | |||
 Open Ocean |
1 to 5 | 8+ | 20 to 30 | |||
| Open seas |
1 to 1 | + | to | |||
| Operation |
2 to 4 | 4+ | 15 to 15 | |||
| Operation Basterds |
1 to 5 | 10+ | 20 to 30 | |||
| Operation Fustian: The Battle for Primosole Bridge July 12-15, 1943 |
1 to 2 | 12+ | 90 to 120 | |||
 Operation Jubilee: The Raid on Dieppe August 19, 1942 |
1 to 2 | 12+ | 180 to 240 | |||
| Operation Jupiter: Churchill’s Plan to Invade Norway, 1942 |
1 to 2 | + | to | |||
| Operation Market Garden |
2 to 2 | 8+ | 20 to 40 | |||
| Operation PBSUCCESS: The 1954 Guatemalan Coup |
1 to 1 | 13+ | 30 to 45 | |||
| Operation Storm-333 |
1 to 1 | + | to | |||
 Ophelia: Histories Collide |
2 to 2 | 13+ | 30 to 90 | |||
 Ora et Labora |
1 to 4 | 13+ | 60 to 180 | |||
| Oracle |
3 to 5 | 8+ | 30 to 60 | |||
 Orb Hunters |
2 to 5 | 8+ | 15 to 30 | |||
 Orbital Velocity |
2 to 4 | 10+ | 20 to 40 | |||
 Orchard Ocean |
3 to 4 | 14+ | 60 to 90 |