Amazon has been slacking over the last few days in the FREE app category, so when we saw a classic like today’s, we just wanted to drop it a quick mention. X Construction is one of those architectural puzzle games that doesn’t appear to be all that difficult at first glance, but once you get going and realize that building bridges that can handle the strain of a train is quite difficult, it becomes addicting. Again, this isn’t some groundbreaking concept or rocket science, but it’s definitely worth a few minutes of your time this Saturday while you are stuck at the mall shoppin’ with the wifey. Another game with a little more spark than this is called Tiki Towers. Highly recommended.