All 4 games are free for 24 hours;
SimpleRockets - Build rocket ships with realistic physics and explore the solar system.
SimplePhysics - Design everything from tree houses to ferris wheels and then simulate your design with a realistic physics engine.
Dummy Defense - Protect your dummy from explosions, boulders, spiked walls, and more (using realistic physics, of course!)
BridgeBasher - Design a bridge and then destroy it. Oh, if you had not guessed, this one has realistic physics too.
Shared Via The HUKD App For Android.