You'll get one png file which contains QR code. Scan it using zbarimg and a link to google drive will appear.

Download the zip file from the google drive.

Crack the zip file with any file cracking tool.

After cracking the file, you'll get pass qristal.

Extract the zip file and you'll get a lot of png files which were all QR codes.

Use zbarimg or any QR extracting tool

zbarimg *.png > flags.txt

Note: I replaced "QR-Code:" from all the lines using a text editor.

You'll see many duplicate texts. So let's carve out the duplicates and get the unique ones only using python.

sanitized = []
unique = []

with open('flags.txt', 'r') as f:
    x = f.readlines()
    for i in x:
        sanitized.append(i.replace('\n', ''))

for i in sanitized:
    if i not in unique:
        unique.append(i)

print(unique)

Output:

['CUCTF{This_is_fake_flag}', 'CUCTF{This_is_wrong_one}', 'CUCTF{Not_this_one}', 'CUCTF{can_you_scan_me?}'] 

Flag: CUCTF{can_you_scan_me?}

Original writeup (https://github.com/ninchy0/CTF-Writeups/tree/main/CUCTF1.0/Misc/4R3%20Y0U%20CR4ZY).