Starts with the letter 'O'
- Oblique. Variant with board with 40 squares turned 45 degrees. (Cells: 40)
- Oblique . Variant with board with 40 squares turned 45 degrees.
- Oblong Chess 44. Variant of Oblong Chess on board with 44 squares. (4x11, Cells: 44)
- Oblong Chess 44 . Missing description
- Omnigon. Photos and Review.
- Once More, with Deans. Subvariants of River-with-university-and-cathedral series with extra piece type.
- The One Ring. White wants to get the Ring to the far side and destroy it. (5x8, Cells: 42)
- The One Ring . White wants to get the Ring to the far side and destroy it.
- The One Ring 1. Sample Game #1.
- The One Ring 2. Sample Game #2.
- The One Ring 3. Sample Game #3.
- Onitama. Cards decide how pieces move, perfect information with no chance beyond setup.
- Outer Space Chess. Space-themed game with hyperspace and regular space boards. (5x8x2, Cells: 43)
Total items listed: 13