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(+2)

I don't think there are any secret areas... *looks through the editor*
though there was this hidden skill if you hit z on this spot (its the map between the hub and the maze) outside the lava cave

you can take on the final boss at any point after you get the arrows but i recommend doing all the other bosses first.

as long as you learn the plant monsters weaknesses you can grind for permanent stat boosting items too.