Board Thread:Plants vs. Zombies 2/@comment-25546049-20151022195026/@comment-24275721-20151025160141

HELP TIME: I want to know in which normal level can I can get the highest concentration of Robo Cones and Excavators. For example, I know that the highest number of Arcade Zombies appear on Day 22 of NMT; at 27 (the level in which they are introduced).

I want to know for quest purposes.