Right-click the small white rectangle
Click Select All
Press the backspace on your keyboard
Press Print Screen on the keyboard
Make a new picture file
Right-click the empty area then Paste
Fill any circle until you found a hidden circle
Click the hidden circle in the game
Click the green buttons
Enter the password in the white rectangle
Don't press Enter
Click the center of the game
The answer to level 39 on the Never-ending game is pennywise
BAM
random
the answer is, larve
pants
tetris
the answer is pie
week
pants
73786976294838206464
scream
The answer is 1967