Arrow - move up / down
Spacebar - shoot
The game takes you back in World War 2, where your enemy is trying to destroy the "Pearl" bridge connecting the two hills. This bridge is very important, as your battalions 50 soldiers are stuck in their territory.
Your aim is to protect the connecting bridge and help all the 50 soldiers to come back safely.
To achieve your target, you need to kill all the enemy soldiers; otherwise they will keep on attacking and eventually break your bridge.
Reach reloader chamber after receiving a signal to reload.