A different take on the tower defense genre, and a sandbox game in the most literal sense
Developed by Guerilla Tea for tablet devices, Sandbox Tower Defense is a mix of tower defense and sandbox genres with an action that takes place in a child's sandpit. You will need to furiously dig and build in the sand to funnel those pesky foes away. However, they are persistent and will react, trying to find the best route around to the sandcastle.
But you can place laser-firing tin robots, bomb launching toy dinosaurs or call an alien airstrike, along with many other weird armaments to keep those enemies at bay.