First-person action/adventure The Ball is now available for pre-purchase through Steam. Pre-purchasing before the game's release on October 26 (after which point pre-purchasing will, of course, be impossible) will get you a 10% discount off the game's regular price, as well as an exclusive in-game character for Killing Floor, the zombie shooter from Tripwire Interactive, The Ball's publisher. Here's word on the game:

The Ball is a first person action-adventure game featuring a full single-player experience built on Epic’s Unreal™ Engine 3 technology. As a swashbuckling archaeologist working on the slopes of a dormant volcano somewhere in Mexico, you get stuck in a cavern. It doesn’t take long before you realize this is more than just a cave. You reveal ancient ruins that have been hidden from outsiders for centuries and discover a mysterious artifact, a gold and metal shelled Ball. As you progress towards solving the mystery of this amazing place you must unlock the secrets of the Ball and learn to control this ancient artifact. Venturing deeper into the volcano, you reveal some of mankind’s greatest secrets and you will start to encounter not just puzzles and traps, but also various strange creatures – the guardians of this mystery. These creatures have to be overcome, using only the Ball to defend you.