Games are often free or good. This game is free and good. Skydrift is simple to learn, but hard to play. You are falling from a high altitude toward the Earth's core. To stay alive, you must collect some glowing orbs and avoid hitting obstacles. Movement uses the gyros in your iOS device.
I started with an "I can do this" attitude, but I was soon humbled. At the start, I wasn't even sure what I was supposed to be doing. But soon the fog lifted and I got aggressive with my moves and was picking up the orbs and avoiding collisions.
The graphics are other-worldly and smooth on my third-generation iPad. After a few minutes, I was hooked, trying to go deeper and deeper.