A small test map made for Zombie Panic! Source by me.
Survivors have to go trough an obstacle course and various traps areas to reach the final standoff house, where they can take supplies, barricades, weapons and plenty more.
Zombies spawn either above survivors and chase them, or they spawn near the final standoff house, where they can either: break down the houses defense (will take a while) or enter the control room and manage various map traps.