Advance Wars: Dual Strike Perform the task in the indicated mission to unlock bonus missions where you can get new units. Mission 10: Capture the city east of your HQ. Mission 11 (black boats) Mission 13: Capture the city in the northeast corner. Mission 14 (black bombs) Mission 16: Find the map in the southeastern most city on the small island with the com tower. Mission 17 (Spiral Garden) Have Advance Wars 1 or 2 inserted in your DS at the same time as Dual Strike to unlock the Prequel Bonus Maps at the Battle Maps Shop. Advance Wars 1 Advance Warpaper, Hachi's Land, and Nell's Land Advance Wars 2 Advance Warpaper 2, Lash's Land Map, and Strum's Land Map