Bowser's Castle.
When I first joined the PMDev Team a year ago they threw the concept art at me for this stage. I then put an absurd amount of time into that stage. I had a lot of help from the team with animations and shaders and such because I wanted to try something crazy new and exciting for it.
Fun fact, this stage has actually been in development since 2012. Well before I joined the team. I basically took everything that the team had learned and remade it to be what it is in the trailer.
Peach's Castle was another contribution from me in this patch. This stage was around a 200 hour stage though. HD revamps are a lot easier because you have a pretty good idea of what you're going to make before you start making it, and since this was my 4th stage that I've created for this game I'm just overall getting a lot better at the process
.