How to make Gym Puzzle Scripts? (FL/Emerald)

Hi! I want to recreate the gym puzzle shown in sword and shield's demo (https://youtu.be/-PI22Jjc8pg?t=161) in GBA form, where interacting with signposts changes waterfalls. What kind of script would I need to use to change the map? Examples would be highly appreciated.

You'll want to use the setmaptile command which can change the tile at a chosen X-Y coordinate on the map. You can change the tile to antyhing in that's map's two tilesets. You can also determine whether the player is able to pass over the tile by placing either 0x0 (passable) or 0x1 (impassable) at the end of the command. For example, 'setmaptile 0x3 0xA 0x10A 0x1' will change the tile at coordinate 0x3, 0xA to tile number 0x10A which is impassable (0x1). Here's a quick and dirty script that utilizes the setmaptile command in a fashion similar to your video:


The flag used to check whether the waterfall is on or not is temporary, meaning that it will be reset upon leaving the map like Cut trees or Rock Smash boulders so you don't have to do any finagling of flags every time you leave the area.

Thank you so much, that is exactly what I needed! I'll try that out in a little bit!