You destroy UFOs in Totally Safe Moon Project with the gravity gun's Shoot mode. Keep the gun in your hands, aim at the underside of the hovering saucer, and fire: the beam hits the hull with sparks at the point of impact, the ship goes down, and the first kill unlocks "I Want to Believe".
Totally Safe Moon Project How to Destroy UFOs: the shot
- Keep the gravity gun equipped. It sits in hotbar slot 1 and is the only tool you start with, so it is already in your hands unless you swapped it out for the magnet or the zipline.
- Find the saucer and aim low. They come down over the town as a dark disc with green glowing patches hovering over the streets. Aim at the underside of the ship, which is the part the beam is fired into.
- Fire. The Shoot prompt sits on the mouse wheel, next to Pick Up Object, Drop Object, Throw Object and Rotate (Hold). One shot puts sparks at the point of impact and the saucer comes down.
- Check the achievement. "I Want to Believe" reads "Destroy your first UFO", so the kill registers the first time one goes down.
The gravity gun guide lists every prompt on the tool, including the wheel click that switches it from carrying to firing.
What they do to the run
A saucer is not only a target. Its green tractor beam pulls a player up towards the ship, and it lifts props off your structure while you work on it, so an unattended stack loses blocks from both ends.
Players put the rhythm of a run plainly: you build, and then every so often you have to fight a UFO. That is why a weapon slot matters as much as a carrying slot when you are stacking hundreds of metres of props — the tools to equip guide covers what to keep on the hotbar.
Meteor showers are the other thing that interrupts a climb, and the asteroid rain guide covers what they take off the tower.