Bridge Constructor Playground is a little nice game about bridge building. It's not good like Bridge Constructor Medieval, but basically you can make the same innovations. The biggest lack: theres is not really a story. You just hop from island to island to build bridges across rivers or valleys. The variousity of landscapes is also very low.
There are three different goals: 1. build the cheapest bridge, 2. build a bridge that can handle the weight stress test at its best and 3. build a bridge with only allowed materials. Sometimes there is a limit of money or a certain number of elements you can use. Another goal is to make it safe for trucks. Btw forget about the cars. In the end just the trucks count.
So you play each level 2-3 times to fullfill all goals and then you will notice it's always the same. The bridges with less weight stress are always made out of concrete and cable. The cheapest bridges can be wooden but it mustn't be. And for the material bridges mostly steel and wood is allowed both. Yeah it's challenging but otherwise it can be boring.
Altogether playing this game was mediocre fun but it's OK. In the end there is that notorious facebook achievement which obviously doesn't work for everybody on the first try. That's a bit annoying.