even if its an arcade game but see its have a great reviews :

Official Xbox Magazine   9 / 10

X360 Magazine UK         9 / 10

VideoGamer                   9 / 10

Eurogamer                     9 / 10

1UP                                A

IGN                                9.2 / 10

i played a little from the game and its really awesome and with 1200 Ms point price its really a great deal.

I don't know if I should get it. I was kind of surprised that the full portal game was in their but I already have that...And I don't know if the challengerooms are worth 1200 points.

Yeah, the game is cool but very short, and easy. I played the pc version, but I am pretty sure the same applies to the 360 version.

I played the portal on the orange box and found the standard difficult but when you finished it and moved it to advanced it was near impossible.

Forgive me for being ignorant, but is this the same Portal that's on Orange Box just released seperately?

Same Portal, + 12 (or 14?) new rooms.

I had all other games in the Orange Box on my PC, so didn't buy the 360 version, but will be picking up the XBLA version of Portal: Still Alive this weekend.

For people who already own the Orange Box, it is a bit expensive... but if you love Portal, you have to go for it.

I started yesterday and the fever is back

I think with Portal, dream about it, always trying to find solution even if I'm not playing.

its a little odd that they are charging so much for something that is free on PC though

Portal is a great game but AAA? even adding another 14 rooms, AAA this will not make. As for the cost, i take it these rooms are exclusive to the 360. Knowing how much Portal is loved imagine the cost to MS even for timed exclusivity.

Portal: Prelue just came out for free and it's got a lot more than 12 or 14 maps on it, it's also top-notch quality. Though it is a mod for Portal and only PC users can grab it. My suggestion is to grab that and save yourself 15 bucks.