I dont know when this started, but the game has become buggy. The game crashes when you select the "Build Puzzles" option after working in "Rate Puzzles". The instructions for the Builder section doesnt explain how the process works. Who accepts the puzzles and how often? The pending puzzles section is too small, it only holds 40 or 50 puzzles, I have probably created more like 200 to 400, so far. One of my 7x7 puzzles completed before I finished it. (See Photo) There is a no booster for Hidden Mode. There are other bugs. This game is fun and fascinating. With a little more attention to testing, it could be an excellent game.