I bought this a long time ago for a 5er, but it isn't worth it. The game is alright graphically and it's ok in puzzles and monster and such but the most awful thing of all that takes the enjoyment out of it is this: Enemies respawn, ammo does not. When you shoot a zombie and you move screens, tada it's back alive. Not so bad in general, but you run out of ammo if you keep shooting them and sometimes they can't be avoided. You can not get new ammo and the shooting is hit & miss anyway, so this is a truely fatal flaw.
