you just have to unzip each zip file and use the base64 decoded name of the file as its password
this script does just one step
and it can be used in a while
after a some time the only remaning file in the directory will be the flag

```
x=$(ls Recurzip)
cd Recurzip
#echo "$x"
unzip -P $(echo "$x" | cut -d'.' -f1 | base64 -d) "$x"
if [ $(ls | wc -l) -gt 1 ]
then
rm "$x"
fi
cd -
~
```