Narbacular Drop
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This page documents information about a game running on a non-Valve engine, of which the game was developed by a studio whom has since been acquired by Valve.
Narbacular Drop is a game that released in 2005. It was developed by Nuclear Monkey Software and published by Digipen Institute of Technology. It led to the creation of the game 
Portal.
Hammer 3.x can be used to make levels for the game.
