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.