Smart Dots

Dots and Boxes, the pencil game from the margins of school exercise books, rebuilt with animation and an opponent. Players take turns drawing one line between two dots, and completing the fourth side of a square claims it and earns another turn. The whole strategy is in the endgame, where you deliberately hand over a short chain to avoid handing over a long one, and anyone who has not met that idea before will lose the first three games without understanding why.