Survive the Zombies for Six minutes to win. Use your Pickaxe on trees to get ammo. (Use F for Pickaxe) W to jump out of the Bus WASD to move E to fire/interact/use item Q to toggle the build menu Z and C to move between items in your hand F to use your Pickaxe Pressing 2 will drop the item in your hand. YOU CANNOT RETRIEVE IT! If you are stuck in the wall, hold left and right at the same time. Bandages and Shield Potions disappear once you use them, but Launch Pads and Grenades do not. Rather, they have a delay.
Be sure to double-click the flag. I know virtually nothing about the Save the World mode, so if this is terrible, I am sorry.