Hyper Dyne Side Arms, or just Side Arms, is a horizontal shoot 'em up from Capcom. Up to two players can take advantage of the Mobilsuit, a mecha that can transform into a spaceship and has considerable firepower, to take on an alien invasion force. The Mobilsuits can combine to form a much stronger mech: in two-player mode, this combines both players' Mobilsuits and confers control of the eight-way guns to one player and navigating the combined mecha around the screen to the other.
The game was originally released in the Arcades in 1986. It saw a TurboGrafx-16/PC Engine release in 1989; the US version was published by Radiance. It also saw multiple home computer versions in Europe, developed by Probe Software. The Arcade version was later added to the Capcom Classics Collection Remixed for PSP and Capcom Classics Collection Vol. 2 for PS2 and XBox.