Board Thread:Questions and Answers/@comment-99.140.209.243-20130503210040/@comment-3153244-20130504012122

It does? I'm actually not sure since I don't own BTD5 iOS, but my best guess is probably around Round 50/60. If you are desperate for $50 Monkey Money, replaying something like Mount Magma or Clock on Easy rewards $45/$60 MM respectively - it's also quite a bit easier than Apopalypse.