Ah, just found out that there are no DMs on itch.io. Well, spoilers ahead.
Cross between the crates is a part of equation. And the scanners are an input for an answer.
FIGURED IT IT WAS TUFF
Omg, thanks!
Funny thing - I'm surprised I didn't pass it just by brute force, as the resulting number is the "shortest path" - e.g. not missing a single step, and I already figured I need to use the battery at the bottom. Lol!