The game itself is mechanically pretty similar to the first Portal - you have a portal gun, which you use in combination with cubes, lasers and various other devices to make your way through each test chamber. One of the main areas in which Portal 2 differs is that it includes a lot more of these devices that you have to use successfully to continue through the game - including light bridges, tractor beams, jump plates, cubes that redirect lasers and, my favourite, three types of gel that affect the surface they're placed on.
Propulsion Gel, the orange stuff, has a negative friction. You accelerate quickly to very high speeds while walking on it. The blue patch is Repulsion Gel, which you bounce off. The white gel isn't quite as fun to play with, but lets you create portals on it even if the surface underneath the gel wouldn't normally accept them. A big part of the challenges here are using portals to move the gel from the dispensers to the surfaces you need them to be on.
|If you're havin' turret problems I feel bad for you son|
|I got 99 problems but turrets ain't one.|
The tractor beams are pretty straightforward to use to move yourself or other objects around the place.
|Real-time test chamber construction|
The characterisation and voice acting is similarly impeccable. I'm not real familiar with the actors themselves but they really made the characters. The writing is witty, and I was pleasantly surprised to find no cake-related jokes. I guess Valve got sick of them as much as everyone else. One complaint would be the length of the game, which was still pretty short (though, like I said, I'm yet to play co-op). Then again, if they made it much longer they'd inevitably end up recycling ideas so maybe the length was fine. In that case, then, I feel the price is a bit high for the length. If you feel the price is an issue then I'd urge you to wait for it to go on a good sale or acquire it via other methods, since it really is a great game.
A couple of things at AmiAmi caught my eye recently.
I don't collect Figmas but if I did I'd be all over this one (I'm in half a mind to get him anyway). Kaiji looks like he comes with enough parts to recreate all the games from the first season and he even has a ざわ speech bubble thing!
And a new Yukari by Phat Company and based on a kit. I already have Kotobukiya's Yukari, so I doubt I'll get this one, but I think she's a nice looking figure (well, as far as I can tell from a couple of low-res promo shots). Her hair colour, at least, is a marked improvement from the job on the Kotobukiya Yukari. Regardless, it's good to see all these non-Griffon Touhou figures appearing.
As an aside, I hardly even play the Touhou games any more (except for some occasional PoFV and SWR). I think I'm becoming a secondary. I feel like I should start living up to the stereotype and making some BAKA CIRNO xD jokes but I really don't have it in me.