In Railroad Collapse there are ten levels of railroad that you have to put back together so the train doesn't derail. Just click on the color you want to use to put the railroads back together. Some colors will correspond to others and close or open the tracks. You want to see what colors match whether the track opens or closes. Soon you'll have multiple spots on the track to mend and you may not get the pattern right away! Don't worry; you can always replay a level. You have a time limit for each level so think fast in Railroad Collapse.