I put here three levels I removed from the game because of their difficulties. I don't recommend. They are just complicated and painful.
If you want to give them a try, unzip the following file and copy the contents into the data folder of the original game. The names of these files are 38, 39, and 40, and so they will be replaced by the original 38, 39, and 40 in the game. It would be better to take a backup of the old files before copying.