A deceptively simple edge-colouring duel where a draw is impossible, someone always builds the losing triangle first.
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How to play
Six dots sit in a hexagon with all fifteen connecting edges drawn faintly. Players take turns claiming one uncoloured edge in their own colour. The trap: complete a triangle of three dots all in YOUR colour and you lose.
Each turn you must colour exactly one previously uncoloured edge.
A triangle counts only when all three of its edges are your colour.
Whoever first closes such a same-colour triangle loses the game instantly.
There is no draw, the edges always run out in someone's favour.
Controls
Desktop: click in the gap between two dots to colour that edge.
Phone & tablet: tap between two dots to claim the nearest open edge.
Game modes
Solo vs CPU at Easy, Medium or Hard.
Choose to play Red or Blue, and pick which colour moves first.
2-player hotseat, or online via invite, code or quick-match.
Tips & strategy
Don't build two edges of a triangle in your own colour unless you can force your opponent to fill the third elsewhere first.
Watch for double threats, a single forced move that would complete one of two triangles is how most games are lost.
About Sim
Sim is a classic public-domain graph-colouring game proven to always have a winner. This is an original, free browser version with three CPU strengths plus hotseat and online play.
A free, original browser game on PlayPendium. No download, no install.
