Love the game BUT..... – Trainyard Express Review

I have installed the free and purchased version. I can play for awhile everything is great. Then it freezes up after a puzzle is solved. Have to go out of game close it on my phone and go back to the puzzle I just solved and hit the back button in the upper left corner to move on to the next puzzle. This happens on both versions.
Review by Me 2.0yftfgyfyfyfy on Trainyard Express.