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How would I replicate Splatoon's ink in gml?


I'm trying to make a system where you can ink a wall and climb up, but im so ridiculously new that i have no idea how to do anything of the sort! i already have bullets that are affected by gravity, i just need to be able to change collision blocks to be climbable.

I have sprites of my own of going into "squid form" but im not sure how to use it to swim in ink. what should i do?