1. Select a turret or truck from the bottom panel. Click again to deselect.
2. Click on the grid to build it.
3. Click an existing turret to open the Upgrade Shop.
4. To replace a weapon, click it in the bottom bar, then click 'Equip' on a new weapon in the Armory.
5. Trucks will automatically find and collect resources from the green nodes.
6. Use the scroll wheel to zoom.
7. Click and drag to rotate the map.
Increase enemy speed for a higher score multiplier. You have 3 changes per wave.