Zero Gunner
Zero Gunner is a shoot 'em up developed by Psikyo and released in 1997. The arcade game allows for eight-way movement using a joystick and supports up to two players at a time. Its lock on targeting mechanic allows players to rotate around targets. The game was succeeded by a sequel, Zero Gunner 2 for the Sega NAOMI/Dreamcast.
Gameplay
Zero Gunner is a horizontally-scrolling shoot 'em up, with players tasked to evade and destroy enemies as they automatically advance across the environments. Players choose from one of three helicopters: a Cobra helicopter, an Apache helicopter, and a helicopter gunship. Regardless of which craft is chosen, it is equipped with a basic single shot and a more powerful sonic wave which sweeps across the entire screen.Players can lock-on to opponents, which allows them to freely maneuver around the screen while continuing to shoot the same target.