Simply match 3 or more of the same colored pings in a row or in a column.
Select a ping, and then click on an empty square to move the ping, to group it with pings of same colors. A clear path should exist between the ping and it's destination. Join at least three pings to clear them off the board. Get bonus points for creating a row or column of 4 or 5 same colored pings!
The game ends when you are unable to move any ping.