Not so hard, but there were two ways to do this

1) Google “hackerized” and try to input each character to get the output of the flag.

2) When I saw the flag, I noticed the first four letters were flag

I saw an other l, l33t maybe?

I couldn’t tell if it was zero or ‘o’, had to try it out, Uppercase or lowercase t/T?

The 4 was obvious

y/Y ?

This was some trial and error, took some major hits on the fails %

flag{too_l33t_4_you}

Original writeup (https://medium.com/@prince0f4llsaiyanz/tenable-ctf-2022-hackerized-crypto-a0dc21287248).