How to play
Six dots are joined one line at a time. Players use different colours. The first player forced to complete a triangle entirely in their own colour loses.
One or two players · about 5 minutes
Sim
Draw lines between six dots. The strange part is that making your own triangle makes you lose.
Play
Blue draws first. Avoid making your own triangle.
A tiny graph game
Sim is unusual because a draw is impossible. With six points, someone must eventually create a one-colour triangle.
Use the learning aid
Turn on “show losing lines” while learning. It marks moves that would immediately complete your own triangle, so you can start seeing the dangerous shapes for yourself.
A little more
The goal is to avoid your own shape
Sim reverses the instinct most line games teach you. You are not trying to complete a triangle. You are trying to keep drawing legal lines without ever completing one in your own colour.