David Collison
| Grandmaster |
|---|
| Sudoku & Killer Sudoku |
| KenKen and Sudoku Olympiad Championship |
| Gold: 3, Silver: 3, Bronze: 3 |
|---|
| Sudoku & Killer Sudoku: Gold (2025) |
| Sudoku & Killer Sudoku: Gold (2023) |
| Creative Thinking (WC): Silver (2020) |
| Sudoku & Killer Sudoku: Bronze (2019) |
| Sudoku & Killer Sudoku: Bronze (2018) |
| KenKen and Sudoku Olympiad Championship: Silver (2016) |
| KenKen and SudokuOlympiad Championship: Bronze (2014) |
| Sudoku and KenKen Olympiad Championship: Silver (2013) |
| Sudoko and KenKen Olympiad Championship: Gold (2012) |
| Code | Name | Partner | Medal | Junior Medal | Rank | Pentamind |
|---|