Eurogamer writes: "Last week I reviewed BioShock. Today, I'm reviewing Portal. Tonight I'm gonna party like its 2007. It's foolish to complain though, since it's actually quite refreshing to see that the best games of twelve months ago are still a formidable commercial presence in an industry so often fixated on the next big sexy shiny thing rolling down the conveyor belt.
Portal, for anyone just emerging from a long stay in a dank Mexican prison, is a first-person puzzle game based on the Half-Life 2 game engine and featuring a story that takes place in the same world as Gordon Freeman's adventures, even if the crossover is limited to background details and vague allusion."