In the online game Mr. Jack vs. Zombie, it looks like Jack will have to get a gun from his safe and start killing zombies.
The object of the game is to kill all of the zombies. You only have a certain number of shots. If you don't finish the job with all of your weapons, the level won't be finished. But to get the best results, you should try to kill all the zombies in the area with the fewest shots possible. The job will go better if you do it quickly and well.
Have fun and good luck!