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From christophe PETREL:
Bridgeport GameBridge is a fun game way to exercise your brain and perfect way to pass the time in boring meetings or train ride home. This is all open source. You can try it for free, see the code, and take the whole game apart. Visit the cities full of rivers you. Rivers form the islands with bridges connecting them. To finish the game just cross each bridge once and only once. Each city calls and entertains you with twists and turns, and a little man walking across the bridge. Cities are simple and add more houses to visit, bridges color, tolls and subways. Bridges comes with 80 cities and more on the way. Cities are easy to build slowly, and end with some other hard.