TumeKyouen

Kyouen (共円) is a geometric concept describing four or more points that all lie on a single circle. "Tsume Kyouen" is a puzzle game where you find the combination of stones that satisfies this condition.

Select four stones from those placed on the board and find the "kyouen" — the arrangement where all four lie on a common circle. The rules are straightforward, but as the board grows more complex, spatial reasoning becomes essential.

Features

• A mathematical puzzle grounded in geometry
• Over 10,000 stages with varied challenges
• A clean design that keeps the focus on the puzzle
• Save and sync your progress with account sign-in

Great for fans of mathematics, geometry, or logic-based puzzles.