if you confuse it becuz of my english skill..

level editor: https://gamebanana.com/mods/443629

Xdelta patcher https://www.romhacking.net/utilities/...

timestamp
0:00 intro
0:08 how to install
0:17 enter level editor
0:32 control
0:41 show how to setting room
1:06 collision
1:38 enemies
2:09 toppins
2:31 warp
3:32 secret room
4:28 door
5:07 tiles