Board Thread:Game Discussion/@comment-2601:3C3:C202:5EF0:6871:2B46:2F8C:27F2-20180925042039/@comment-35072544-20180925062106

I think it shouldn't be a problem - people are trying upgrades trees all the time. I just wouldn't do it with WTTT and OMP cars - you could lose your progress, and it might be complicated to get your time/score back. If you want to try it anyway, better quit race before setting a valid time.