Steam news announces that Dead Island: Riptide is now on sale for 66% off, coinciding with a free weekend where you can shoot zombies without taking out your wallet:

Play Dead Island: Riptide for FREE now through Sunday at 1PM Pacific Time! Additionally, you can pickup the full game at 66% off as part of this week's Weekend Deal*!

Dead Island Riptide takes players to the island of Palanai on the Banoi archipelago, infested with bloodthirsty Zombies and only a few remaining Survivors still fighting for their lives. Introducing new terrifying enemies, deadly weapons, a new playable character and much more, Dead Island Riptide will draw players back into a world that has grown corrupt - with the last rays of hope vanishing in rising tides.