Changelog:
Slight tweaks to a13, namely in making C playable again.
C has had a history of blue steamrolling Red, usually caused by having too many routes for free. So I've slowly been whittling down Blue's options to make them more predictable to aid C's defendability, but it seems I've gone a step too far. Hopefully this version strikes a nice balance, I've brought back Blue's shortcut to the highest level, but hopefully they won't be able to overuse it, so Red still has a chance.