Midnight is a seven map mappack that revolves around Chell and an unknown character as GLaDOS puts her to testing. Each level have their own achievements and ends with a post-game report, that shows which achievements were obtained and the time taken to complete the map.
Test Chamber 01 - Chamber 2 Overview 3
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Description
An overview of the second chamber.
Looks PeTI-ish.
But with texture variety and a sign near the button.
Still, looks VERY PeTI-ish. Those are CLEARLY 128x128x128 blocks.
Perhaps he is making a PeTI draft before refining the details.