Portal was released in 2007 by Valve Corporation. It originated from a student project called Narbacular Drop, developed by students at DigiPen Institute of Technology. Valve hired the team and adapted their concept into Portal. The game was created to introduce innovative gameplay mechanics and to complement Valve's existing portfolio with a unique puzzle experience.
Portal
Portal is a first-person puzzle-platform video game developed by Valve Corporation. It challenges players to solve puzzles by placing interconnected portals, allowing them to teleport between two points in space. The game combines innovative gameplay mechanics with a compelling narrative centered around the player character's escape from the Aperture Science facility.

About Portal
Strengths of Portal included its innovative gameplay mechanics, engaging narrative, and strong character development. Weaknesses involved its relatively short length and limited replayability. Competitors at the time included puzzle games like Braid and first-person shooters such as Half-Life 2, also developed by Valve.
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