About & Contact

QED Night is a free game site for an evening with friends or a few minutes alone: board and card games we built ourselves — chess, xiangqi, caro, werewolf and more — games from other studios that we play and approve one by one, a daily puzzle, and a short story every evening.

The name comes from quod erat demonstrandum — "that which was to be demonstrated" — the line a mathematical proof ends on. We keep to it: our computer opponents play at the strength they claim, puzzles are checked before they are published, and every game from another studio is played by a person before it appears here.

QED Night is operated by Cassau LLC.

Questions, bug reports, a game that misbehaves or a puzzle that doesn't check out — email [email protected].