Team 17 is currently holding a sale on its library of Android games. The sale includes Worms 2, Worms 3, all three Escapists Games, Sheltered, Flockers, and Penarium.
The Worms games go all the way back to the mid-90s, and the format has remained remarkably intact since then. It sees you assuming control of a team of worms and trying to take out an opposing team of worms using a variety of lobbed projectiles.
The Escapists, meanwhile, is a modern classic strategy game series in which you have to help some prisoners abscond from a prison.
All of the games in the sale are dramatically discounted, typically coming in at between 25% and 50% of the original prices. You can check out the Team 17 sale here.