Here's an offer that iDevice owners should not miss out on: 1337 Game Design's disc-rolling game Dark Nebula - Episode Two is free to download from the App Store throughout the weekend. In it players are tasked with getting a circular object to the exit area without losing too many lives, using only the accelerometer function to control all of the disc's movement on screen. The nineteen levels included in this sequel sounds a bit on the short side, but there are plenty of clever puzzle designs and tense action sequences that'll keep you hooked until the final challenge is beaten.

We suggest grabbing Dark Nebula - Episode Two before the free promotion expires. A trailer for the game can be found in the extended, and you can watch it while waiting for the 80MB download to finish.