If you meant Video Game Designers, then they do a myriad of designing tasks.
The most common (but by no means is this list exhaustive) include:
NB: For all intents and purposes, when referring to design, I am not talking about visual design/concept art etc.
To design the video game.
They are different kind of video game designers here are some I know of: 40g-75g Game Designers: $40g-$70g Creative Directors; Lead Designers: $45g- $90g.
They design video games...
Anywhere.
No
Video game designers
Video game programmers are the people that setup the game and do all the mechanical procedures. Video game designers make the games plot and control what happens in the game.
Hollywood
Yes they do
They design videogames.
How much money do video game designers earn if the console sells extremely well?
There are lots of different video game designers so there is not a pacific one