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Is it still worth playing?
Valve's 2007 first person puzzle platform game, released in The Orange Box for Windows and the Xbox 360. You play Chell with a portal gun that makes a blue and an orange portal, and the two link points in space, with neither end only an entrance or an exit. Physics carry through them: an object keeps its momentum through a portal, and the exit portal's direction sets where it goes next. The rooms set limits on that tool, since portals cannot be placed on moving objects, glass, liquids or areas too small, and Emancipation Grills remove active portals. Weighted storage cubes are the other tool, holding down large buttons. After the main game, Challenge Chambers set goals for fewest portals, steps or time. One tool and its momentum rules still open many solutions today, and the humour and writing make you want to keep going.