Maybe all those boxes are someone's feeble last attempt at holding back the zombies, and you are really a giant jerk because you keep breaking them down.
I found a bug where a number was missing. The column read 1 1, but it needed 3 squares. And it wouldn't let me complete the level, even though all the numbers are lit up...
Hi, our current system with the grey numbers only shows you that you have found the corresponding blocks. However, it doesn't expicitely show you blocks which are set incorrectly. I assume your problem is, that you have found all blocks correctly, but there is (at least) one block 'too much'. If this doesn't help, you can send us a screenhot of the level and we'll hint you to the problem :).
I'm sorry, but PathPix is much better than this. Granted, it isn't an online game and I did have to pay for it, but if you're going to copy a game you should at least try to improve upon it.
 "simian.interface"){kind=icon}
 "Earn to Die 2012"){kind=icon}
 "Infectonator 2"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "HUEBRIX"){kind=icon}
 "NoNoSparks: The Ark"){kind=icon}
 "Color Link-a-Pix Light Vol 2"){kind=icon}
 "Ultimate Assassin 3: Level Pack"){kind=icon}
 "Earn to Die"){kind=icon}
 "Farm and Grow"){kind=icon}
 "Blocks"){kind=icon}
 "Hanna in a Choppa 2"){kind=icon}
 "Farm of Souls"){kind=icon}
 "Snakes On A Cartesian Plane"){kind=icon}
 "GOBTRON"){kind=icon}
 "Achievement Unlocked 3"){kind=icon}
 "Epic Coaster"){kind=icon}
 "Champions of chaos"){kind=icon}
 "Coinbox Hero"){kind=icon}
Hi, our current system with the grey numbers only shows you that you have found the corresponding blocks. However, it doesn't expicitely show you blocks which are set incorrectly. I assume your problem is, that you have found all blocks correctly, but there is (at least) one block 'too much'. If this doesn't help, you can send us a screenhot of the level and we'll hint you to the problem :).