Hands down one of the best games I have ever come across. I liked how the only time you had to deal with ads was when you wanted to use a hint... normally I wouldn't praise an app for using ads to give hints.. but unlike all other apps I’ve used that FORCE you to watch the entire 30 to 60 second ad and penalize you for clicking off early (by not giving you the hint).. this app doesn’t; there is about a 5 second countdown before you can click off the ad to get your hint. So props on that. I did however end up buying the premium version because there were a few puzzles that I found a little too difficult and I wanted to skip them. So paying $3 to remove get the ability to skip a level is not asking too much at all (plus it removes the "hint ads"). [Possible Spoiler]: My one and only criticism for this game is that one of the early levels requires you to click on the circled question mark (?) on the top right hand side in order to solve the puzzle and once you do it sends you back to the main screen, a little annoying. All and all this is my favourite game yet... great job to the creators.

Puzzles are about discovering the mechanics specific to that puzzle. It's mostly done well, though some concepts repeat a bit too often for my preference. If you've played any of Bart Bonte's other games, you know what you're in for. There is one major drawback for me; sliding tile puzzles. They feel like a departure from the discovery style of the other puzzles. They were a frustrating disappointment every time they came up.