Gun Mayhem is a flash format shooting game developed by Kevin Gu. Players choose from 10 maps in a game that includes battles in prehistoric times, medieval times, and the present day. To win the game, players must kill as many enemies as possible. Players can customize their play styles, too. Each level in the game features perks such as triple jumps, no recoil, and extra ammo. Despite its simple gameplay, Gun Mayhem is an enjoyable shooter.

The original Gun Mayhem game supports up to 4 players, and the sequel, called Gun Mayhem 2, is a more complex and challenging game. There are also smarter bots and flashier guns in this sequel. There are several game modes, including campaign mode, where players blast opponents off platforms. If you prefer a single-player game, you can play as a bot. You can also play this game with a friend on the same computer.

The controls for Gun Mayhem are simple, and it has 16 stages to play. The controls are simple, and the game features a walkthrough for a quick guide. To move around, hit buttons on the left side of the screen. To automatically target enemies, you can tap on the trigger button or swipe across it manually. While the controls may be simple, the game's complexity will make it difficult to master the game in a single sitting.