That's pretty much all there is to X Construction, build a bridge, hope it doesn't collapse. You're not under any time limit, you've got as long as you want to try and construct a solid (or solid enough) structure from a limited number of girders. Once you're happy, hit the go button, and watch as your bridge swings and sways before the train has even got near it. As the train crosses your bridge, girders start to turn red as they're put under too much stress, if the train doesn't move onto a different part of the bridge in time, then the girder will break and the train will fall causing all the passengers on board to scream.
Looks and Sounds (3 out of 5)
The graphics are nice and cartoony, and the girders turning red when under stress helps to tell you where the weaknesses are in your bridge. There isn't that much in the way of sound, apart from the noise of the train moving along the track, the creak of the girders, and the screams of the falling passengers as they plummet to their doom.
Gameplay (4 out of 5)
Each screen has a broken track where the valley is, so the first thing to do is put girders across the valley to complete the track, then you can either try to support the bridge under its own weight by building across the top, or some levels have anchor points below the track, so you can build downwards to support your bridge. If you've got enough girders, try to do both. To place a girder, you just touch the place where you want it to start, and then drag it to where you want it to end and then move your finger away from the screen. This means you can make some girders shorter than others, but they have a maximum length, and sometimes it can be a bit fiddly if you're trying to place a girder between two points as your finger is covering the part of the screen you want to see. The girders do turn green when you've successfully placed them between two points, but they do still sometimes jump to a different position as you remove your finger. Helpfully, there's an undo button to remove the last girder you placed, and you can click on the spanner icon to change to removal mode and remove individual girders with a single tap.
Value for Money (5 out of 5)
X Construction fits into what I think is the ideal category for mobile/handheld games, you can pick it up and have a quick go, or you can have a longer session if the game sucks you in. There is no single solution to the levels, so creativity is encouraged, and the bridge doesn't even have to remain intact, as long as the train makes it across ok, you've completed the level. There are higher skill levels (heavier trains) to keep you playing, and your constructions are scored, so there's incentive to try and make a better bridge.
There's a free version available in the market place as well, so you've got no excuse for not trying this out. The full version adds more levels, removes the ads and promises more levels in the future. Give it a go, you'll be surprised how addictive bridge building can be.
References and Images
X Construction, https://market.android.com/details?id=de.hms.xconstructionfull