I am trying to edit sprites at runtime (using a sprite to store a large map), I know the sprites can be resized and from what I can tell the limit is 512 pixels in dimension?

I managed to draw to the sprite using set_draw_target() and then pset to draw the pixels I want, but I can't figure out how to then read the pixels! The guide mentions sset and sget which I know from pico8 but I can't make them work for some reason, I figured maybe I need to return the sprite as a user data with get_sprite but then sget doesn't seem to be a function of user data and can't find anywhere that explains how to use sget and sset.

Also I know the sprites will reset when the game is run so how would I then overwrite the sprite with the edited version so I can save the generated map?

I was wondering the same thing. Sset and sget are in the picotron user manual, but in picotron they aren't highlighted as valid functions.

sprites are just userdata, so you can do :get and :set on them.

sget & sset are for interacting with the spritesheet, I don't think you can use them for editing a userdata: https://www.lexaloffle.com/dl/docs/picotron_manual.html#sget

Soupster is correct 🫡
I suggest you read the userdata section in the docs: https://www.lexaloffle.com/dl/docs/picotron_manual.html#Userdata

Thank you Soupster, that makes so much more sense :)