Kind of fun, although to me there seems to be a bit too much guesswork as to what you're actually supposed to do. For example the puzzle for day 8 (and especial

Kind of fun, although to me there seems to be a bit too much guesswork as to what you're actually supposed to do. For example the puzzle for day 8 (and especially day 9) doesn't really tell me anything about what I'm actually supposed to achieve, and clicking "learn" to find it out actually gives the solution outright.