I'm taking it upon myself to recreate Abra's classic, using the official damage numbers and stats and suchlike to stay true to the original gameplay. My reasoning behind this is that, BYOND has a lot of neat new features that Castle could greatly benefit from, and the original Castle source is, pretty crappy (It doesn't even make use of icon states, everything is its own icon. Lol.) and it would be quicker and easier to just rebuild it from the ground up.
Please don't hesitate to point out any differences between this and the original Castle, and I'll be sure to step on them asap!
So without further ado, go forth, and never forget to buy MOAR BGERS.
Open source! - https://www.dropbox.com/s/xysrmcdrvdvwy4n/ Castle_src.zip?dl=0
I do wish you keep the hub the same so as to keep the Castle community together, but otherwise you're free to change and mod whatever you like into it!
Obviously enternal credit to Abra for all art, sound and gameplay credits!