itch.io

Thanks. To clarify, I wasn't asking you to replace them with trivial challenges, but rather simply challenges that the player can see upfront. Like I said before, you have to be very careful when introducing and building upon invisible blocks, to the point where you basically have to design the whole game around them and use them frequently in order for them to be intuitive and fair, especially if you're gonna use them without hints. Not even Lost Levels could pull that off perfectly, so don't feel too down about it. 

One example of a potential replacement could be: for Load-Bearing Grid's first painting, below the bottom jump-through platform in that shaft, add one extra jump-through platform that can only be reached by jumping from the item block. Then, you could add a spike on the left side of the new jump-through block so that a simple running-jump wouldn't be enough, and the player would also have to slow down at the right time to land safely. That should be non-trivial enough for world 3, don't you think?