Very good box! I have learned a lot and thank you all for good advices! the tip:
- Do not overthink the solution. Try easiest options first.
- For point 1, when you find the thing check how you can expand it, how it works.
- Connect to the box and enumerate it. Once again the solution is straight forward. Once you will get it try to find how you can get more perm.
If anyone will need hints I’m happy to assist.