Don't underestimate this game!
If you can solve the first 50 levels of Manifold, you are already an excellent player. If you can solve all the levels before #80, you are truly an expert. Take a moment to celebrate, before you start the final 20 levels.
I'll be honest with you: it takes more time to solve the last 20 puzzles than it takes to solve the first 80. I recommend that you try them all by yourself, without reading this post. Then, if you need some help, have a look at my solution for #84.
After folding two horizontal lines that separate the middle 4 rows from the rest (this will help me later on), I try to figure out how to bring all these little white triangles together so that they join the big white 2×2 square. The picture on the right shows how I want to achieve that: I will hide the two gray triangles under the big white square. I don't know exactly how it can be done, but I can already prepare some of my creases, as shown by the green lines.
I try to fold along the green lines that I just made, but it doesn't hold. It can be frustrating, but it's important to take my time and never squash the paper. The only way to have a nice and clean solution is to fold straight lines: horizontal, vertical or diagonal (45°).
The trick is to get rid of the two gray hexagons. I start by folding clearly along the green lines (picture on the left), in a way that would push their center towards the table. After doing that carefully and precisely, the paper seems to like my plan: gently pushing the top and bottom of the paper toward each other works perfectly.
When I release the paper, it forms a nice 3D shape with lots of 90° angles. I simply continue to hide the gray areas, and then flatten the part where the white spaces are. The whole form isn't flat, but the most difficult part is done.
I flip the shape over. There are two corners of paper right in the middle of the shape. Without folding anything, I bring them down and hold them with my finger. The challenge is now to bring back the black spaces, and this can be done by folding along the green lines (picture on the right).
I flatten the shape to form a nice square, and that's it!
© 2013-2014 Jérôme Morin-Drouin - All rights reserved