No Kidding

70 points
Solves: 209 Easy
No Other Kids Invent Anything like this...lol

Flag Format EZ-CTF{WHATEVER_THE_MESSAGE_IS_ALL_CAPS}

Solving

This looks like Multi-tap or something similar... let's just use the numbers and see what happens.
I'll use dcode.fr for this.

8/44/444/7777\\\444/7777\\\8/44/33\\\555/2/6/33/7777/8\\\222/8/333\\\333/555/2/4\\\33/888/33/33/33/33/777

T H I S\\I S\\T H E\\L A M E S T\\C T F\\F L A G\\E V E E E E R

Okay let's add _ and try 🙂

EZ-CTF{THIS_IS_THE_LAMEST_CTF_FLAG_EVEEEER}