A full double-six set of 28 tiles. Play a tile that matches either open end of the chain. Six tiles each, sixteen in the boneyard. Play a tile and the chain grows; no tile that fits means you draw until one does (or pass once the boneyard is empty). The round winner scores the pips left in the opponent’s hand: an empty hand wins outright, and if both sides are stuck the lighter hand wins the difference. First to the target score takes the match. The AI is one-ply greedy: it takes the heaviest tile it can and prefers to break its own doubles last.
Reversi on a hex board. Stones flip along the six straight lines through the hex you play, and the game ends when neither side can move.
A minimax opponent that does not let you win.
Two-player board with check, checkmate and a live ELO rating.
Draughts with forced captures, kings and a simple AI.
27 elements, density physics and real pair reactions — pour, ignite, dissolve, grow.
Draw one freehand circle and get scored on how round it really is.
Every rule you satisfy unlocks a worse one. Ten rules stand between you and the win.
You have one billion dollars. Try to actually spend it.
