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Electronic Arts - Portal: Windows - $19.99

SynopsisFrom the creators of Half-Life 2 and Counter-Strike comes Portal, a single-player blend of puzzle, action and adventure gameplay. In this game, your mental abilities are your best means of survival. Learn how to open and control Portals to manipulate objects and move yourself through space. Physical puzzles and challenges require you to size up the situation and come up with the best solution. Unlike many games, Portal challenges you to think before acting, the way Half-Life 2 called for carefully planned use of the Gravity Gun. In addition, level editing and mod creation let you build your own Portal puzzles. Just when you think you've mastered it all, two bonus games provide new tests of strategy. Hours of intense and captivating gameplay show why Portal has earned more than 40 awards, including 15 Game of the Year honors.

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