A free program for Android, by NeoFrontier Technologies.

FreakLabs Underground FPS 3D is a first-person shooter (FPS) game designed to have a retro style and the vibe of the first and most popular FPS games. It guarantees to run smoothly even on old Android devices. The controls of this game are simple, easy, and have typical features from those of the conventional ones so, familiarizing yourself with its features doesn’t have to take oso much time. Playing this can be done on a phone screen however, for a better experience, it is recommended to do it with a game controller.

FreakLabs Underground FPS 3D is completely free and will let you experience an action-packed gameplay