Flow is an abstract 2-player competitive game.
The win condition is simple, get four of your player pieces lined up in a row on the board before your opponent does. However, don't let the simplicity fool you, there is a depth of strategy to discover.
Each turn you must perform two actions in the following order:
Place one of your player pieces onto the board.
Push one of your player pieces, as well as every other adjacent piece in the direction you push.
The winner is the first player to get four of their pieces in a row going vertical, horizontal, or diagonal. Because pushing a piece can also move your opponents pieces you can foil their plans at creating a line, but if you are not paying attention you are just as likely to inadvertently create a line from opponent pieces and win the game for them!
—description from the publisher