"Slingo Classic" is available for free on Slingo.com, as of May 2015. You can play as a guest or become a member of the site for additional features.
Visit the Slingo.com home page, and place the cursor over Games. On the drop-down menu that appears, click on All Games. Click on "Slingo Classic (multiplayer)" under the Slingo heading. Click either Play as Guest to load the game, or Connect using Facebook to log in through a Facebook account before playing.
In "Slingo Classic," you start with a board of 25 numbers, with rows and columns of five squares. When the red button flashes "Take Spin," click that button. Each spin produces five numbers or icons below the board. Click any numbers on the board that match a number from the spin. The goal is to cover every square on the board.
Icons include a joker, a super joker, a devil, a gold coin and a free spin. A joker can match any number in its column. A super joker can match any number on the board, but it must be used first during a turn. A devil takes half your points, although if a cherub appears, this is prevented. A gold coin is worth 1,000 points.
You can use a free spin to buy any of the final four spins.
The game is over after 20 spins. The first 16 spins are free, but you must buy the final four spins with either points or a previously earned free spin.