Try to reach infinity before your opponent by getting four marbles in a row.
Players have 8 marbles of their own colour, plus a joker. They take turns to place marbles in the bottom row of a 4x4 grid. marbles in the same column as the marble just placed move up a row, and if there was one in the 4th row it gets pushed out of the grid altogether (and is then available for the player to use again). After each turn, players score points for getting 4 marbles in a row, with extra points if their joker is involved. The winner is the first player to get 5 rows ahead of their opponent (to "reach infinity"), or to score two rows of 4 on the same turn.