A numberof factors have come together to make the iPhone a surprisingly viable gaming platform, and the unassuming Jungle Swing pretty well illustrates all of them.
Jungle Swing
iPhone/iPod Touch
Price: $1.40
Conceptually, it couldn't be simpler: The goal is to keep the monkey swinging, Spider-Man style, from tree to tree without falling into the water.
Playing is simple, too, but as is the case with the best low-concept games, mastering the timing and swing physics takes a lot more skill than the one-button control scheme initially implies.
A handful of unlockable items and upgrades is on hand to reward players who sink a lot of time into the game and OpenFeint support sweetens the deal with online leaderboards and unlockable achievements.
Finally, there's that price tag.
Swing, like so many absurdly-priced iPhone games, costs less than a bag of chips.