Today's Reversi Puzzle
How to solve
- Play the moves for Black on the board. Your opponent replies automatically.
- Tap the square where you want to place a disc.
- You can try again as many times as you like. Show answer plays the solution (that day then does not count toward your streak).
Difficulty by day
The difficulty depends on the day of the week. The date changes at midnight Japan time.
| Day | Difficulty |
|---|---|
| Mon | Easy |
| Tue | Easy |
| Wed | Medium |
| Thu | Medium |
| Fri | Medium |
| Sat | Hard |
| Sun | Hard |
Past puzzles
2026-10
- 2026-10-15Medium・one move
- 2026-10-14Medium・one move
- 2026-10-13Easy・one move
- 2026-10-12Easy・one move
- 2026-10-11Hard・one move
- 2026-10-10Hard・one move
- 2026-10-09Medium・one move
- 2026-10-08Medium・one move
- 2026-10-07Medium・one move
- 2026-10-06Easy・one move
- 2026-10-05Easy・one move
Where the puzzles come from
We make the puzzles ourselves and use a solver (a program that searches for the answer) to check that each has exactly one solution. When we include a classic problem, we take the position from an original book whose copyright has expired and check it again with the same solver.