Play
Place your side on an empty touching space that still fits within a possible 3 by 3 grid.
Flip
With at least 5 tiles, flip an opponent tile if you have the fewest showing.
Slide
Move one tile orthogonally into an empty valid touching space.
Score
Three in a row scores. Two separate lines using five cards score twice.
No moves
Remove one of your own tiles. At 160 turns, higher score wins; tied score is a draw.