Octex is a 3D path-making game for two players.
Rules
Tiles: Two players, White and Blue, share a common pool of Octex tiles as shown in Figure 1. Each tile is octagonal, divided into four colours and has a coloured square plug of half thickness centred on each face.
Start: The board consists on an 5x5 grid of square holes which is initially empty
Play: Players take turns placing a piece to nestle in either:
1) An empty board hole, or
2) The square hole formed where four tiles meet on the same level
Aim: A player wins by forming an orthogonal or diagonal line of three bumps of their colour, such that the bumps at each end are joined by a connected path through same-coloured regions (not including any bumps). If a move achieves this for both players then the mover loses.