Tatsujin is a vertical shooter by Taito and conversion of Toaplan arcade game originally released in 1988. The evil Gidans are about to invade the Borogo system, their armada of giant asteroids are approaching and they have to be stopped. The player must infiltrate and destroy no less than five large enemy facilities and take down swarms of alien ships and all kind of ground units. The space fighter comes equipped with a default Vulcan gun (Power shots) and two more weapons are available for the taking - the blue lock-on lasers (Thunder Laser) and green blasts of energy (Tatsujin Beam). The only way to increase the active weapon's firepower is to collect Power Boosters special flying pods leave behind. Although five boosters are necessary to trigger a power-up upgrade and boost up the strength of the current weapon, special red flashing power icons bring it up to maximum power in no time. Each weapon can be powered up to three times for maximum collateral damage and smart bombs in the shape of monstrous skull-faced energy blasts can be unleashed to kill most enemies on screen. Finally, speed boosters are strategically placed throughout the game to help the player dodge enemy fire more efficiently.