The Game of SIM

The Game of SIM Rules

Each player should have their own color to draw their lines in.

Using different colors, players take turns drawing lines to connect any two of the vertices on the diagram. Each line can only be used one time.

Players continue taking turns until a player forms a triangle that is solely made up of their color. The first player to form a triangle in their color LOSES.

The game’s creator, Gustavus J. Simmons, specifies that “only those [triangles] with vertices on the six starting points” count. If you happen to create a small triangle caused by intersecting lines, this is fine. It does not end the game.

For example in the game below, the red player would not lose because though a red triangle is formed, it only has two of the original vertices as corners instead of all three vertices.