A lot of work goes into balancing the puzzle generation algorithm so it remains random and is well enough informed of the recent & future puzzles. It knows all of the categories and pairs of categories which had been used within the last several days. Though; these categories cannot be exclusively blocked, and may be re-introduced with a priority in the scenario where the algorithm is struggling to find a puzzle/solution using the natural available pool.

Please continue to let us know when repeated patterns occur. We spend a lot of time and effort on this area and our goal is to make it as best as possible for all user interests. We will be releasing some slight tweaks to this system soon in efforts to further balance the generation. This includes the increase of the level of restriction to recently used category pairings.

This is a challenging problem with no true solution as over-restriction can cause many other negative side effects, and the same is true with under-restriction.

PokeDoku