Board Thread:Plants vs. Zombies 2/@comment-5760976-20150905233630/@comment-24735666-20150906135521

''" It will be called Greatest Hits. The jams function uses in a random method, but there will be at least from two to five jams playing in a level repeatedly and randomly. The first jam will last maximally three waves, then the next jams will last maximally two waves. All Neon Mixtape Tour zombies excluding Zombot Multi-stage Masher will appear in this Endless Zone." ''

So that means that there won't be all 6 jams in a single level but there have to be at least 2 of them. First jam can last for max. 3 waves. Later jams have 2 waves limit, but 4 waves is max for level so it doesn't matter. Unless waves don't mean flags. Then it can be weird.