tinyBuild Games' Divide by Sheep [$0.99] was definitely an interesting little puzzle game when it first released, straddling the line between being a casual math puzzler with a cute look, with challenging puzzles and a surprisingly-gory macabre theme. If you haven't checked this one out yet, and you've been meaning to, well, now's as good a time as ever, as the game has just gotten its 5th world in the latest update, along with a cool $0.99 sale price.
The new levels are the "World of Ruins" and they add in a new gameplay mechanic, a death totem that kills everything on the platform that it lands on, be it sheep, wolf, or pig. Plus, it can kill wolves that have already eaten sheep, throwing yet another new trick into the fray. You'll need 280 stars in total to play the latest update, so if you've sent plenty of sheep to their demise already, now you'll have more opportunities to do just that. Otherwise, it's time to get cracking!