The last feature the game includes is the Gretzky challenge mode. Similar to the "Madden Challenge" or the crib/skybox challenges in the ESPN games, these are little goals and challenges you have to achieve and overcome while playing each mode of the game. They can range from simply getting a hat trick to shutting out an opponent. Completing these challenges earns you points that you can use to unlock assorted content bonuses, like alternate and classic jerseys. And just in case you were wondering when exactly The Great One's influence would actually become apparent in the game, there are multiple versions of Wayne Gretzky included. There's an Oilers-era Gretzky, a Kings-era one, a Rangers-era one, and even a Team Canada one. Of course, each of the four versions is rated through the roof, and each can put up some serious points if he's placed on a team. Sadly, the inclusion of the four Gretzkys is about the only real boon in the game's unlockables mode. There really aren't all that many jerseys to unlock, so there's a generally pretty limited scope of content to choose from.
The choppy frame rate makes it near impossible to properly set up plays, and the lousy puck handling doesn't help matters either.
If it weren't for the frame rate, Gretzky might qualify as a pretty-good-looking game. It's obvious where 989 pared down the graphics to make it run on the PSP, but overall, things like player models, animations, and arenas all look pretty nice and detailed. However, had the developer sacrificed a little more in the way of graphical detail to try to make the game run well, the gameplay would have fared much, much better. As it is, you end up with near-PS2 quality graphics and a PlayStation-era frame rate. Not good. There's no commentary, but that's not a criticism. The commentary in the PS2 version was mostly boring and uninformative, so the absence of it here is not a bad thing. Apart from that, you'll hear some solid in-game sound effects and a host of generally inoffensive but not particularly good rock tracks to fill out the soundtrack.
Gretzky NHL is likely to be the only option for hockey on the PSP for a good long while, but unless you're absolutely chomping at the bit for some NHL action, you shouldn't bother with it. Simply being the only hockey choice doesn't excuse things like the awful frame rate, the sloppy puck handling, and the generally lackluster gameplay that Gretzky NHL offers. You're better off without this one.