3 Hidden Stages

[Megaton]

So after finishing Bubble Barrage 12, I was sent to a screen with 3 more levels where you use a shower curtain item. If you back out of the screen when it pops up, you have to beat BB12 all over to access it again. I can't seem to find anything about these stages online. Are these brand new?

[LinkMaster10]

its probably part of th whole #PotatoFoolsDay ARG (http://forums.steampowered.com/forums/showthread.php?t=1818741)
and Aperture Science was originally a shower curtain company...

[Megaton]

Think they're required for the True Champion achievement now. I've completed everything else but the 2nd and 3rd new hidden levels and it didn't unlock for me after BB12.

[in.meinem.turm.]

You get these test-levels by creating a new profile with the name potato.
They are new "test" (http://steamcommunity.com/id/come_on_fhqwhgads/screenshot/578919816076130460?tab=public) levels.

And there are 6 stages. 3 Levels + 3 bonus levels that are unlocked after completing the first 3.

[vempajor]

Well, it looks like the method doesn't work any more. You could reach the Potato World with your normal profile by completing Bubble Barrage Normal 12. The secret levels remained there after you closed the game without going back in the Menu (so you could continue your progress when you started the game next time).

After the last update I can't get this World. I went back in the Menu mistakenly after the 4th new Bonus level, so I had to solve BB12 again, but nothing happened after that, I lost the access to the new levels.

Only creating a new "Potato" profile would show these levels but all are locked (as it is a new profile). I'd wanted to complete my last 2 levels what I was missing but as I see there is no way.

[ASecondOpinion]

Only creating a new "Potato" profile would show these levels but all are locked (as it is a new profile). I'd wanted to complete my last 2 levels what I was missing but as I see there is no way.

Creating a new profile locks all of the other levels, because of a new profile, but the <Test> World level 1 won't be locked. Complete that to unlock level 2 and then that for level 3?...

[vempajor]

You are right, but I already completed them on MY profile, I won't complete them again on other profile when I needed only the last 2 levels to reach 100%.


EDIT:
I managed to solve my problem, I could rename my old profile to Potato and can continue the levels.