Hello everyone
I was looking around Noah's park stage and happened to bump into a secret? red door which you have to use Zero to double jump to. After u beat the onslaught of wasps or bees or whatever and kill the annoying machines with the shield on the ramp or whatever.
When you get to the part which drops down and eventually goes into the walls which move in and out. Don't drop down there but stay on the ledge. Get Zero and jump up the left wall and you have to double jump to the other ledge which holds the red door.

Now that you are there. I was wondering if there is any way to get through that door? maybe a special attack or move? Otherwise i have no idea. Please respond and leave any discovery. I have read through quite a few walkthroughs and none of them show this door. maybe it has gone unnoticed.

Cheers
-TIM-

have 2 red metals and you can open it by pressing the button of the part that you need to jump to get to the boss door.

I'll check this out and get back to you, you've peaked my interest