Trainyard

Trainyard is a puzzle solving game unlike any that you've ever played. It's easy to learn but very tough to master. Your job is simple: get each train to a goal station. Red trains go to red stations, blue trains go to blue stations, etc. You control the trains by drawing track for them to follow. There isn't a time limit or even a score; the only thing you need to do is figure out a solution for each puzzle.