Eleven bots, weakest to strongest.
Every bot here runs in your browser, on your own device, so a game starts at once, costs nothing and needs no account. Pick an opponent, choose whether to move first, and the board opens.
The Quoridors series is a ladder to learn on. Scout looks one move ahead and never places a wall. Pathfinder searches deeper but misses walls. Builder plans ahead and uses every wall it has, and Strategist searches deep and plays a pure race perfectly once both sides are out of walls.
The ACE series are full engines, from ACE Classical, a pure search with no neural network, to ACE KYA, a neural network guided by Monte Carlo tree search that won 15 of 18 games against every other engine on the site. ACE Ishtar and ACE KYA need a browser with WebGPU; where it is missing, the list says so.
Daedalus is our own engine, the one that reviews your games: a neural network trained on hundreds of thousands of its own games, searched by Monte Carlo tree search, with an exact search taking over for proofs and the last walls. It runs on any device and uses its spare cores, so it is strongest on a desktop.
New to the game? Read the rules and play a few games against Scout, or read the strategy guide before taking on Strategist. When you are ready for people, play online.