The game involves shooting down extraterrestrial objects that appear on screen. The player controls a space fighter, using a mouse or keyboard to aim and fire at incoming UFOs.
The core mechanic is straightforward: destroy as many enemy ships as possible before they disappear from the screen. The player's score increases with each successful hit. The game features a variety of alien ships, each with different points values.
The objective is to survive as long as possible, racking up points without getting hit by an enemy ship. The game runs in the browser, with no download or registration required. Players can start immediately and begin shooting down UFOs without interruption.