3 stars: 90% of the levels require no thinking whatsoever. They look complicated, but there's only one path to take. Eventually the levels get reused, but the block is turned so it looks slightly different. Good concept, but the levels need more thought put into the design.
3 stars: No issues with playing game or glitches. Los of ads, (to be expected). I'm on the 400's and the frequency of trickier puzzles has improved. Otherwise, it's not hard to paint when you only have two choices on direction. I definitely like when there are more choices of direction. Occasionally, you can paint yourself into loop that you cannot get out of to completed.
3 stars: Level of difficulty increases far too slowly. I'm over level 400 and still way to easy. Was hoping to get to the level advertised by now, but not even close. Even at this level, there are many levels that only have one route through, making it a mindless task. The controls and graphics are excellent. Would be nice to have different groups of challenges at various levels of difficulty to choose from.
3 stars: I went up to level 75 and there were MAYBE 10 challenging levels up to that point. It's more for aesthetics than mental exercise. The levels lead you through a straightforward path so you really can't screw it up. As for ads, there were plenty, but you can skip each ad after 5 seconds. Which is superb. Don't make me sit through the whole ad every time. Overall it's fun, it's just not challenging. So I'm uninstall...