Portal Test Chamber 17 (Advanced)
|“I can't get over how small you are!”
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This is the fifth advanced chamber of the game. This version is unlocked when the original Test Chamber 17 has been completed. It has the extra challenge of replacing the Companion Cube with a spherical replacement, harder directing of the Pellets into Pellet catchers, as well as an extra flinging section near the end.
Beat two Portal advanced maps.
Beat four Portal advanced maps.
| Vanilla Crazy Cake|
Beat all six Portal advanced maps.