Trapped behind enemy lines, you become the heroic Cloud Soldier after a daring escape in a vintage WWI airplane. Take to the skies in level after level of exciting airplane combat, buying upgrades and even whole new planes as you go. One of the keys to Cloud Soldier is upgrading your airplane. Remember that you can buy both Double Fire and Bombs for your plane, but you can only equip one at a time. Having both can be a lifesaver, though - it just depends on the mission.you can hit the Escape key at any time during a mission and run away with all of your credits intact use arrow keys and A key for movement.