Expanding the Brain

"Expanding the Brain" is the first episode of Arin and Danny's playthrough of Portal 2.

Gameplay
Arin and Danny begin the co-op campaign. Since they skipped the tutorial, Arin spends most of the episode teaching Danny the basics of how puzzle-solving in Portal works.

Discussions
Danny has significant difficulty wrapping his brain around Portal's puzzle solving mechanics, saying that spatial awareness puzzles are his greatest weakness.