It took us almost 2 years of hard work to make Fold the World. All levels and worlds first were made of paper.
The most difficult in the development process was the creation of levels. The development of level editor for such game was extremely challenging, in that case each puzzle was done manually. First, game designer cut it out of the paper, then artists modeled and tuned level, and only after that level was built by programmers in the game. 3 days of work of entire team to make 1 level.
Also we many times remade the collecting puzzles and story pieces. First we were trying to let player fold the story himself (thats why you see pictures of story on the background of all levels), but it was very hard for players to understand, so we changed it.
See the video, how it was made!