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Portal: First Slice was the demo version of Portal.
Portal: First Slice consists of test chambers 00-10, with a total of 11 test chambers.
It was originally available on Steam for any user with an Nvidia graphics chipset. The demo was distributed along with Half-Life 2: Deathmatch, Peggle Extreme, and Half-Life 2: Lost Coast.
After some time, it was eventually made available to all Steam users, before being completely removed from Steam during the "Portal is Free" marketing campaign.
- The origin of the title First Slice, is a reference to the cake that GLaDOS proposes to Chell, what was thought to be a major ruse, and was turned into an internet meme, but was seen later in the game.
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