I want to make a game in Unity 2D but all the walk script tutorials do not work. 
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Did you apply physics to your game, apply the script to the character, and in your scripts, does the sprite/character get increased velocity?
Or do you mean with frames, then make a walk cycle using a picture editor, create a script that sets the frame over so many ticks, to change the image?
if all of these apply, and it still doesn't work, I can't help you. I use Gdevelop