Ten years ago, the thought of a battle in the portable gaming market was ludicrous. Nintendo had held such a dominant position in the space for so long that it seemed impervious to any sort of challenge.

The field was littered with failed opponents, but things started to get a little more interesting in late 2004, when Sony jumped into the market with the PSP. By the time Apple launched the App Store in 2008, a full-fledged war was underway.

Read more at Yahoo! Games