Monorail is a challenging find

My twin brother LOOOVES logic puzzles. You know, the ones with the boxes, where you have to find out which of four friends in a coffee shop had both a black coffee and a bagel while wearing a green sweatsuit, but he gets bored easily, so I decided to buy him an app on my phone he could use when we were both out together, at appointments or whatever. The problem is, I wont put it down long enough to let him play it! I figured, "Well just do the free version", and a day later, Id bought the full! These puzzles are RIDICULOUSLY frustrating, but once you FINALLY find the right answer, you want to keep doing more. Probably my favorite thing about games like this and Temple Run is that you can put it down, but youre always willing to pick it back up.

Wish I could give this ten stars!!!

Zenechai about Monorail