Ideas for my map I made

Hello, I am trying to come up with more ideas for my map. I will put the link in here. Can anyone try to give me ideas. If it is a code to escape one of the rooms I have no idea how to do that, I have tried looking it up and found some but could never understand some of it. So if you do recemend codes for escaping current room pls also tell me how to do it with pictures.
I cannot paste the link so here is the title.

Escape Room World History

  1. your not allowed to add links here
  2. Welcome to the forums even though it isn’t in the best condition
  3. A code could be like a lock, where you need to get all 4 digits correct. A guide to that 4 Digit code system

Welcome to the forums @LukeGimkit!

Thank you. I really like that you went out of your way to say welcome.

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I have tried that guide and what I got stuck on was the part about the repeater. I have understood it until you reach the channel you put it on. Starting on the channel part all the way to the first part of it I do not understand it at all. Repeaters are very confusing for me. Do you think you can try to explain it and also put a picture with it on what it should look like for the channel. Thank you if you can.