Oddly Hard Makes a Sport of Being Nearly Right

Field notes

The collection reduces each challenge to a short loop: understand the diagram, receive feedback, get a numerical result, and try again. Its six games cover timing, reaction, memory, color perception, estimation, and geometry, with stated play times from roughly 15 seconds to two minutes. Records are kept under one versioned browser key, with JSON export, import, and one-click deletion. The site also presents a daily challenge and a Chrome companion, while disclaiming any cognitive-testing or medical purpose.