Good question because I can't guarantee it's always solvable... 😰I was originally going to randomly create the daily puzzles by reverse solving but due to lack of time to work on it I didn't get around to trying this. Once I added the randomly placed unmoveable square, that solved the issue of unsolvable placement for small number of tiles (3-6) because it allows you to rearrange the tiles in all iterations of adjacent placement. This does not appear to be true for all placement of larger number of tiles which is partially why I capped the level where I did. I did go through and test what the first 2 weeks of daily puzzles would be and they were all solvable. I do plan to go back and address this possible issue post jam, just because it's an interesting problem.