Chain (Mind Loft)

Chain takes the pencil game of dots and boxes, where you join two dots and close a box to move again, and gives you only its ending. By the time the board reaches you, every safe edge is gone, so any line you draw opens a chain of boxes for the other side. The question is who runs out of quiet moves first.

That is why grabbing every box on offer can lose. Sometimes the right play is to take most of a chain and hand the last two boxes back, keeping your opponent on move; sometimes that is exactly the mistake. The day's board is checked so that exactly one edge still wins, and the engine you play against does not make errors. There is a hint button, but no take-back: every edge you draw stands.

The header shows the date, your time and the box count, and a leader line shows the fastest player so far. Past boards stay in the Mind Loft archive with each day's standings, and Sundays bring a larger or harder Sunday Edition.

Chain is one of about a hundred free daily puzzles on Mind Loft, alongside other endgames such as Four (connect four), Mate and Defend (chess), Check (checkers), Turn (Othello) and Yose (go). It needs no account.