Qika Quantum Game vs Euclid Quest

Qika is a quantum game which you need to apply quantum gates to qubits in the grid. You need to change the states of qubits by applying gates in order to reach the target measurement. Have fun!

Euclid Quest turns classical geometry proofs into a calm, paper-and-ink puzzle game. No typing, no formulas to memorize upfront: tap the angles, segments and triangles in the figure, pick a theorem, and watch your proof grow line by line until Q.E.D. HOW IT PLAYS • Tap elements in the figure, then choose the reason — every step is a real geometric inference • Equal values carry over automatically and appear right on the figure • Stuck? A hint can highlight what to select, and the free theorem guide shows a worked example for every rule WHAT'S INSIDE • A hand-crafted main journey across 6 chapters: vertical angles, parallel lines, triangles, congruence, circles and more • Thousands of extra practice puzzles in the puzzle bank, with fresh daily picks • A gentle tutorial guided by Euclid himself • Full offline play — proofs work anywhere • Available in English, 繁體中文, 简体中文, 日本語, 한국어, Español, Français and Deutsch For working adults who miss the satisfaction of a clean logical argument, students who want geometry to finally click, and anyone who enjoys puzzles with real substance. Every proof ends the same way: Q.E.D. — and it feels earned.