XX Mission

XX Mission is a cooperative vertical shooter released in 1986 by UPL for two players. Pilots alternate between aerial and ground attack modes to combat waves of approaching enemy craft, ranging from small fighters to massive fleets. As you progress, powering up your ships unlocks powerful new air attacks and expands the range of your ground-based weaponry depending on the current form. Gameplay requires strategic coordination between both players as they navigate through increasingly challenging levels filled with diverse threats. The game features a distinct visual style complemented by audio from Yamaha YM2203 sound chips, creating an immersive experience for players working together to achieve high scores. A secret bonus can be earned in the Missile Zone by strategically leaving some missiles intact, rewarding skilled play with additional points—a testament to the depth hidden within this fast-paced shooter.