The PlayStation 2 version of this collection features support for progressive-scan displays, while the PSP version includes different visual options, letting you play in the games' native resolutions or stretch them to fill the screen. Both versions give you the option to save your progress midgame if you want to. We noticed a slight "ghosting" effect playing some of the games on the PSP, causing the backgrounds to go a bit darker when in motion, but this wasn't a big deal. The PSP version also features Wi-Fi support for the two-player games in the collection, though you'll need multiple copies of the game. However, easily the biggest difference between the versions is in their unlockable bonus games.
Some unlockable Sega arcade games are included as a great bonus, along with a number of developer interviews.
On the PlayStation 2, you can unlock the original arcade version of Altered Beast, which, as you may discover, is superior to the Genesis version that's included in the package. You also get the isometric arcade classic Zaxxon and some other obscure but interesting titles from Sega's early arcade days. On the PSP, the arcade standouts include Super Zaxxon and Congo Bongo, but there's nothing from the late '80s like Altered Beast. That detail, along with the PSP version's higher retail price, make the PlayStation 2 version of the game the better choice for most people, unless you strongly prefer the idea of having these games with you on the go. Minimal loading times in both versions and a great menu system that lets you easily switch between different games makes it convenient to quickly browse through the lineup before hunkering down with some of your favorites.
The Sega Genesis Collection is one of the most satisfying, well-put-together classic game compilations to date. That it's available for a budget price on the PlayStation 2 makes it all the more tempting, though being able to take these games with you anywhere makes the PSP version a great choice, too. Even if you were an avid fan of the Genesis back in its heyday, chances are you never got around to playing a number of these games, many of which are still quite fun and remarkably challenging even by today's standards. Or, even if the Genesis is before your time or you simply never got one, there's just so much history packed into this collection that it'd be a great choice for anybody interested in video games in general.