Pixel Puzzles: UndeadZ

Pixel Puzzles: UndeadZ is an untraditional jigsaw puzzle -- drag the pieces around the screen and drop them wherever they fit in order to complete a picture. What is untraditional about it is that, while you try to solve the puzzle, zombies attack you. This zombie attack is shown in a screen strip below the puzzle itself from a 2D, top-down point of view. There you can move a character with the keyboard -- you can also shoot zombies or throw grenades at them. As you place puzzle pieces, you earn "Zombucks", which can be used to buy ammo, barricades, grenades, mines or puzzle hints.

All in all, there are 19 puzzles to be solved, the first few with about 60 pieces each, all the way to a few hundred pieces towards the end. As expected, the pictures you are putting together are zombie-themed, with tons of gore and horror.