NELG

I don't think it's easy. I try to print the screen and type in the letters on the screen, and my mouse turns yellow and blue. Next, I continued to print and found a lot of rectangles. I tried to click these mysterious rectangles according to their positions, but there was no progress. And I painted the rectangle and found the mysterious symbol. Am I wrong? I hope someone can help me.

You're on the right track keep painting and finding things and putting things together