ctf-writeup/LA CTF 2023/hidden in plain sheets

hidden in plain sheets

I found this google sheets link on the internet. I'm sure it's hiding something, but I can't find anything? Can you find the flag?

Choose any link (they're all the same): Link 1 Link 2 Link 3

About the Challenge

We were given a google sheet and we need to find the flag from that google sheet named flag

How to Solve?

First we check the google sheet to find something interesting and i found new hidden sheet

And then in google sheet there is function named IMPORTRANGE to import data from another sheet even the sheet is hidden.

I immadiately create a new sheet and using the function like this

IMPORTRANGE("https://docs.google.com/spreadsheets/d/1OYx3lCccLKYgOvzxkRZ5-vAwCn3mOvGUvB4AdnSbcZ4", "flag!A1:AZ1")

And we will retrieve the flag

lactf{H1dd3n_&_prOt3cT3D_5h33T5_Ar3_n31th3r}