Ringo

Four in a row wins!

This victory condition is well known, but Ringo puts a new twist on the concept. The playing area is an unbounded square grid. It starts with eight rings: four red and four blue. On a turn, the active player places a disc of their color in any ring of their color, then moves the ring to an empty space orthogonally adjacent to any other ring. Whoever first creates a row (orthogonal or diagonal) of four discs or four rings in their color wins!