Study River Logic Marathon

Daily visual logic marathons — no words needed. 24 timed puzzles, 20 seconds each, 8 minutes flat.

Every video is a full marathon: sequences, matrices, rotations, symbol equations, paper folding, cube nets, block counting, missing pieces and more — 13 puzzle types drawn from classic culture-fair reasoning tests. 15 seconds to think, then the answer.

No language required. Just shapes, patterns and a countdown. Play along, keep your score, and drop it in the comments.

New marathon twice a day.

🖨 Printable A4 logic drills, made with AI → https://eidendo.co.jp/studyriver

Not an IQ measurement — just good thinking practice, for students through seniors.