How do I create my own fan-made bossfight?

[MythlyInari]

With all those fan-made bossfights on youtube, my inner boss-fight addicted self (I REALLY love fighting bosses in games. A LOT.) wants to express itself with it's own madness.

Where do I sign up to make these? Do I need to know gamemaker?

And I mean legitimate battles.

https://www.youtube.com/watch?v=GBV-HogOlz8

This^



not "Animation" battles.

https://www.youtube.com/watch?v=arvDV2JGE8s

[dat_potatoe]

I'm assuming these people are making their own 'games' from scratch using gamemaker, instead of modding the files of Undertale itself.

[Sebithelord]

Same, same.

[ditt_25]

Generally making their own games from scratch. Either via

Game Maker (which is what Undertale itself was made with [as was Spelunky and Hotline Miami and a couple other notable indies]), as their own made from scratch game

OR

Unitale (a fanmade attempt at recreating Undertale battle mechanics within the Unity Engine, but restricted to just battles, no map, exploration, etc).

I have heard of people scripting the heck out of RPG Maker to simulate Udnertale battle mechanics, but haven't checked out how accurate or easy to use that is for an UT inspired system. Plus, you know, RPG Maker isn't free.

[shortMortem]

And how to make lvls?