User blog comment:SW8573/What is the farthest anyone has ever reached in BTD4/Expansion?/@comment-124.180.230.39-20120409011524/@comment-202.150.1.25-20120623120846

Yes, you can, on Apopalypse Mode. I don't know that but I trust it on two ways.

1. Bloons Wiki said it is possible on Apopalypse Mode.

2. I seen someone is on Apopalypse Mode, at round 425.