Has Steam Cards (free pennies), achievements, zombie puzzles and has also been given away before so if you're reading this then you probably already have it!
Pixel Puzzles: UndeadZ is a traditional style jigsaw puzzle game with top down shooter gameplay thrown in to ruin your day and peaceful puzzling experience. Dead things want to eat you whilst you puzzle. You'll have to keep the dead dudez at bay with a mixture of mines, barricades, bullets and nades.
You'll need to spend Zombucks on defences to help you keep back them shamblers. Barricade the roads, line the floor with mines, do anything you can to fortify the path before the hoards of reanimated reach you (an mess up all your pieces).