Excellent idea, very original, I liked it very much. Some of the puzzle can be a little hard to figure on our own, I had to used to walkthrough for the first one and for putting the poster numbers. It is specially hard for the first one I think when the player don't know yet what the game is about. May be starting with an easier one will make less player look to the walkthrough. The one based on the resolution was really clever and it is nice that the last one was based on two different ones, it makes the game less linear. I was a little disappointed that there was no effect of the settings on the "real game" (no music after the music is enabled, no way to move freely after the end, ...) but overall it was very smart and very enjoyable puzzle game !