Tags: base64 crypto 

Rating:

1. Open the `output.txt` file, and strip the content of newlines and spaces
2. Feed it into a loop which applies `b64decode`
3. And print the output, if it starts with our flag prompt `CHTB{`

Original writeup (https://kblagoev.com/blog/nintendo-base64-cyberapocalypse-2021-ctf/).