Award-winning, steampunk-inspired indie puzzler Cogs is available now on the Mac App Store. The game, which is sure to grind your gears at higher difficulty levels, has also been discounted across all Apple devices it's available on for a limited time.
The iPhone/iPod Touch version is currently free, while on iPad it's $2.99. On Mac, the 50 percent discount puts it at $4.99. Honestly, the Mac version is probably the best idea -- far less chance of throwing an entire computer across the room in frustration.