I think I've discovered an ambiguous case on level 38 in challenge mode (medium)? The 2 squares that need shading in the top row could go in any of the 3 white squares, and the white square in the first column could either be 'on' or 'off'. https://imgur.com/a/kPxdt
Also I can't help but feel some of the levels are literally a bit hit-and-miss. I know there's not meant to be much room for error but sometimes you'd fail a level purely by chance. Other than that, 5/5.
Found an even faster way to earn garnets without needing to constantly upgrade 'corporation' to get extra crystals. Once you've already spent a large enough sum on corporations, it eventually becomes much more profitable to trade between scraps and garnets in the stock exchange. Buy scraps when the value is 9,800 - 9,999 and then buy back the garnets when the value is 10,000 - 10,200. Once you've saved up a few million garnets you'll get tons more using this method as opposed to ~50 garnets per crystal. I currently have 520m garnets and made about 7m in just two clicks.
In a points battle I think it would be a good idea to deduct points from anyone who gets hit, so that players can gang up on the leader to steal points.
So good try noob hehe :D