Rating:

In this challenge we were given a picture.

in the picture, there are three columns of shapes, each with seven coloured stripes. Red stipes correspond to 1, white to 0. While addin the 8-th bite 0 to the beginning and reading the bites from top left down each column to bottom right. The binary we get is 01101000 00100001 01100100 01100100 00110011 01101110 01011111 00100100 01101000 00110011 01101100 01101100 01110011, which translates to ascii h!dd3n_\$h3lls, which is the flag.

Original writeup (https://github.com/keyboard-monkeys/ctf-writeups/blob/main/2021-UMDCTF/misc_testudo's_message.md).