Pick the zombie spawn bricks from the menu.
Place the brick.
Take you your wrench.
Click the brick with your wrench.
In the drop down menu thing, select the zombie you want.
Click send.
Open up you menu.
Select Mini Games.
Click Create Minigame.
Set everything to how you want, but make sure you set player type to Survivor.
Click send.
????
End game.
Destroy your hard drive. Jk