Most of the puzzles are pretty easy and even those “Super-Hard” ones have a couple of easy puzzles too. The game usually lag on the puzzle selection page and sometimes during solving puzzles. Like sometimes it would not switch between X and fill, you had to click it again (which might not sound as bad, but considering how many times you switch between them and how many times it happens, its really annoying). Control method is bad, it have only 2 options and the alternate option is completely unusable and the default is pretty bad, maybe just remove the function where you drag and fill in a line, since it’s pretty easy to draw somewhat straight with your finger, that function only adds difficulty because sometimes you want to fill a column, but it jumps to row instead and that can really destroy your entire progress. Also, need more missions, maybe daily missions so that we don’t have to wait until the next day or play those puzzles earning only 1,2 or 3 tokens. Another issue is with the main page, it’s pretty big and sometimes when you want to use your tokens efficiently, you would need to scroll and click across the entire map in-order to find the right puzzle that cost exactly how many tokens you have (like if you have 22 tokens, you would want to unlock a square that cost 22 tokens and not unlock a square with 15 tokens, because that would be wasted), solution for this is the question mark thing you have implemented, but instead of it randomly popping on random squares, make it pop up on the square with the most efficient token usage like if you have 25 tokens, the question mark would appear on a square with 25 tokens or lesser if you have unlocked all of the square that cost 25 tokens.