Attention! This is only needed for those who are not familiar with it!
Hello! I decided to end the myth of the 'Gray Ball Secret Achievement' once and for all. We all know about the gray ball? Yes! And it turns out that you don't need to dance with a tambourine to find it ... Go to the folder:Steam\steamapps\common\GarrysMod\garrysmod\lua\entities and find file sent_ball.lua, open this file and head to line 65.You should find self: SetBallColor there, and below Vector. Insert this text at the very end: Vector (128, 128, 128),. Yup, good job. Go to the offline game and go play!