I've been inspired by my friends to make a writeup for even the easiest challenges, because they are really helpful for others :)

Hardware:

• Registers Matter [347 points] (12 solves)
  GoogleCTF 2020 qualifiers (ctftime) - solved together with @psrok1
  writeup
• Comlink [394 points] (7 solves)
  GoogleCTF 2021 qualifiers (ctftime) - solved together with @NieDzejkob
  writeup
• RetroPwn [451 points] (3 solves)
  Insomni'hack teaser 2022 (ctftime) - solved together with @NieDzejkob and @akrasuski
  writeup

Web:

• Angular of the Universe (flag 1) [139 points] (39 solves)
  TokyoWesterns CTF 6th 2020 (ctftime) - solved together with kannthu
  writeup
• Angular of another Universe [239 points] (8 solves)
  TokyoWesterns CTF 6th 2020 (ctftime) - solved together with kannthu
  writeup

Misc:

• babyshell [242 points] (38 solves)
  Dragon CTF 2020 (ctftime) - solved together with @ptrcnull
  writeup
• CoolNAME Checker [324 points] (19 solves)
  Dragon CTF 2020 (ctftime) - solved together with @ptrcnull
  writeup