It's a very neat concept that I haven't seen done before. Can I recommend it though? Absolutely not. While zombie wave shooters and jigsaw puzzles are in no short supply on Steam, you don't usually see them in the same title. Unfortunately, it's bad at being either. I honestly don't understand who this could cater to. You like puzzles? Well, they're ridiculously easy. They click in place and you're even given the option to freely have the picture appear to guide you if it's somehow not already easy enough for you. You like zombie wave shooters? I'd play something like Infectonator: Survivors instead, it's extremely basic and 'meh' even compared to flash games from the early 2000's. You like easy 100% achievements? Heh. The puzzles might be stupid easy, but the achievements are ridiculous. No, seriously, for two of them you have to ♥♥♥♥ing spam the right mouse button for an hour straight (you can't pause) killing zombies at the start menu, then keep killing them until you've killed 5000; if you die or have to take a leak you just wasted a good chunk of your life you won't get back. The only challenge in this game is suffering through the boredom to finish it.