Portal is a new single-player game from Valve creators of Half-Life 2 and Counter-Strike. Set in the mysterious Aperture Science Laboratories Portal has earned over 40 awards including 15 Game of the Year honours and offers gamers hours of unique gameplay.. . The game is designed to change the way players approach manipulate and surmise the possibilities in a given environment similar to how Half-Life 2s Gravity Gun innovated new ways to leverage an object in any given situation.. . Players must solve physical puzzles and challenges by opening portals to manoeuvre objects and themselves through space. Award-winning innovative gameplay The first first-person puzzle action adventure game Two bonus games introduce new play challenges Support for level editing and mod creation - build your own Portal puzzles Hours of single-player gaming