AR apps don't get much better than this. Transform your surroundings into an alien battle field, while trying your hardest to save the planet from evil alien scum. They can be quite crafty and attack from all angles, so conspicuousness isn't exactly the game's strong point - but that's part of the fun. Saying that, it's probably best not to play it in crowded public places… or any public place for that matter.
New video! AR Invaders app review
AR Invaders brings the classic alien invaders game to the 21st century. Best of all, it's only 59p