There are some very tricky puzzles that will require some thought. The thing that’s missing in the game is that the cursor does not change when it hovers over something useful, so while a lot of the things are obvious, you might spend some time randomly clicking around the screen.
There is a hint that you can get after five minutes. Prior to that you have to figure it out on your own or, if you can’t, wait until the timer runs down in order to get the clue. At times, they’re not all that helpful either so you might get stuck for a longer period of time.

But even at 5-7 minutes per puzzle, it’s a short game with only 25 levels or max 3 hours of game play. It took me about 1.5 or 2 hours to finish it. Plus, some of the repeitive clicking levels are bound to give you no end to frustration not to mention repetitive stress syndrome.
The game is currently 10% off at GamersGate and that puts the price at 8.95 Euro (normally 9.95). Even then, I would be hard pressed to tell you to buy it. Two hours of gameplay and no replay value for about 10 ($ or Euro) just doesn’t seem like a good investment to me when there are $20 or $30 point-and-click adventures out there with far greater play times. If you’re a diehard fan of point-and-click adventures then it might be worth it to you. If you like a short quick challenge and are willing to drop the $10 this might be worth it.