Make Your Own Super Mario Bros 3 Game Without Gamemaker
Update: I won't give support for this engine because I'm not the maker of it, sorry. I only made the open source engine which you can find there: www.youtube.com/watch?v=PqbWUKYTLm0
The open source engine is fully editable, if you know how to use gamemaker.
This is a video of a mario builder than used to be done with my engine. It was quite promising but unfinished. You can still make a game with it though.
Here's a link to try it out: 64digits.com/users/djrellik/mariobuilderv12.0.zip
About the video, I'm using what was currently available to the builder to create quickly an overworld highly based on the one I made on my engine. I improvised a lot and I tried to show most of the stuffs so don't complain if things look weird :P Anyway the link I provided has a much more complete version.
Anyway check out the video respond if you want to see the engine in action.
TO EDIT THE CASTLE AND BARRACKS! you need to edit the levels 13-15 for the barracks and 16 for the castle. Sorry if it wasn't clear, the guy that was working on it forgot to include it in the "manual". The rest though, is explained in the game so I won't answer those questions. Make an effort