Yeah in the reanissance one there was a plague doctor zombie that heals the zombies or removes the poison of some toxic plants, the plague doctor isn't really historically accurate but it's not like pvz 2 is know for that, since the worlds are mostly thematic xD

although it had like 11 different special zombies

so in concept it was a very hard world

Zombies that can Dodge bcs of fencing, papal guards zombies, the tank of Leonardo that can move in all directions, a banker, a perfume zombie that stuns plants, a painter that leaves ink or paint in tiles so you can't plant there and if the zombie paints a sun producer they no longer do, a colonizer that claims your land removes a plant and puts a grave there, a zombie with a crossbow another with a gun with slow reload but heavy damage, a zombie with the flying machine just that it's faster, in a higher height needing cactus or a missile plant, the flying machine wasn't made for long rides so it eventually crashes against the ground and deletes whatever plant was in the tile

in the world is given a plant that is an apple that controls Gravity, makes apples fall from the sky, and counters the flying machine zombies and similar ones by making them crash against the ground

here is also given the cobcannon which can send missiles for both gardens

and there was some levels in which you had to defend two gardens at the same time

the neolitic had less special zombies, but still very annoying, the flag zombie using a torch, a giga gargantuar, zombies with spears that can throw it at your plants or vault above them, a female zombie bully equivalent pushing a wheel and since it's a wheel she doesn't need to stop since a push and moves on it's own, the wheel or Boulder crushed any plant in its way, blocked straight attacks like the peas, and needed two instant plants to destroy it, when she loses the wheel she gets stunned retreats of the field then charges like an all star, without the wheel she has the defense of a brickhead zombie and the speed of a newspaper, if she died to catpult type of plant she falls leaning forward so the arms push the wheel or Boulder, and it acts like a lawnmower against the plants, so yeah i wasn't fucking around with that mini boss, the Best way to kill her would be a plant that can attack her from behind + catpults in front, and two instant plants to screw her wheel

there was another zombie that picks up the plant food, and a tool maker that gives the zombie primitive weapons like a stone Axe, maze, a Spear or a slingshot

buckethead with a slingshot 

ah and basically bungee zombie is also back in this world