This stage and Robot Master are NOT in the game you currently have. They are only under development.
Whirlpool Man is a robot master idea I've had in mind for a quite a while now and his stage is directly inspired by Kevvviiinnn's Stage 48 song. Unfortunately, that song is already used in Megaman: Rock Force so Kevvviiinnn composed a brand new song just for WhirlpoolMan. Thanks a LOT man! ^_^
So, in my free time since the release of Megaman Unlimited, I've been messing around with some new enemies for this stage. With help from Jansim to implement the whirlpool mechanic, the stage is completely designed at this point. Only thing is, the boss isn't done yet. Megaman arrives at his lair and he just does nothing.
At some point, this stage might be added to the game in a future update along with a couple of other features Jansim is working on. As usual, I can't tell exactly when this whole thing will be finished but I'll keep you posted whenever interesting stuff happens.
In the meantime, you can download the game here: http://megaphilx.com/?page_id=1003
And you can check out our Facebook page for updates here: https://www.facebook.com/pages/MegaMan-Unlimited/114325318655039