R.O.B's Computer is a race course that's new to Mario Kart: Mega Mash-Up. It appears in the Thundercloud Cup.
This is a course based on a computer's motherboard that is floating in an area of dark space. You drive around the board swerving it and out of various different parts. In areas of the map that aren't included as part of the track, various coloured R.O.Bs are cheering racers on.
- Various R.O.Bs - There are multiple R.O.Bs positioned in areas of the board that you do not drive through and they are cheering the racers on.