All games on Big Fish Games are 30% off until Sunday. (Use coupon code SPRINGFEVER at checkout.) Plants vs. Zombies is half price at PopCap for a limited time. Torchlight is just $5 on Steam through Monday. Sandlot Games’ free game of the week is Slyder Adventures. Playrix has just launched the Mac version of Gardenscapes and is selling it for 50% off until April 2.