Added our old enemy, the insta-kill cart

Hope you all can help me , I just started playing about a week ago and am playing on normal game difficulty and have leveled up so that I'm playing each level on the highest level difficulty. But I keep running into levels where i can only get 90% mobs and either miss chests or a secret even after playing with the map up and filling it completely , I know that the map for each level changes each time you play it but does the secret/chest count change or does it stay the same no matter what version of the level map it loads, and also I've seen on some play through of secret levels , like the switch on the bridge in pumpkin pastures so do I have to complete the game first and switch to adventure difficulty before I can actually get to all the secrets , chest and access the secret levels that the random switches open. Thanks in advance and sorry for such a long post

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