13 4 2Actions Report Solution Natural progression. Solve Test Chamber 11 (which is pretty easy) and you'll get thisShowing both comments. Leave a comment. Didn't pop for mePosted by ReallyGothPuppy on 13 Oct 20 at 01:31 Sorry to hear that, but it's a natural progression achievement, so there's nothing wrong with the solution ... Hope it's popped for you now.Posted by Rileymesh on 20 Oct 20 at 12:00 Leave a comment