Fulfilling GameSpot's commitment to both highbrow culture and toilet humour, this week's tests contain:
a. Lovely opera
b. A toilet
But a giant one, mind you, full of turrets, that you can flush with the power of portals. This latest batch of player-made puzzles have Cameron and Jane navigate that colossal lavatory, sneak into a sentry turret opera, and play a spot of golf with Excursion Funnels.
Download this week's tests from the Steam Workshop
Have you made your own test chambers? Seen any you think should be featured? Let us know in the comments below, or tweet us @gamespotuk!