The Home Screen:

Green Box: Different sections of the game which you can get to by clicking the text
Blue Box: Your car you have set as selected.
Light Blue Box: Shows game information such as; Points Balance, ELO (Ranking system), Your overall record and membership type.
Red Box: Shows ELO Scores, and daily best ET's and RT's.
Pink/Purple Box: Recent announcements related to the game.
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The Race Tack Screen:

Orange Box: The Pre staging and staging lights.
Green Box: Shows a diagram of the staging track. You are aiming to get as close to the back of the dark green box as possible
Red Box: Adjust different graphic/game settings and your cars shift light.
Yellow Box: Displays your RPM's and MPH
Blue Box: Your accelerator and gears.
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The Garage Screen:

Dark Green Box: Used Car/Part lot links
Pink/Purple Box: Car information including; HP, Name, Team and nickname
Red Box: Links for the paint shop, Sell your car, change it's nickname, adjust ratios and change accepted races.
Green Box: "Set this car as selected" means to get into this car.
Yellow Box: Accepted Races. H - Head to head. B - Bracket
Light Yellow Box: Spare parts that have not been installed.
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The Parts Store Screen

Green Box(es): Shows the pink ticks which means the parts are installed on the car.
Orange Box: Shows the whole list of parts in the different sections
Blue Box: Part information, eg conflicts/requirements. Also "Buy" and "Uninstall" button appear so you can buy or uninstall the part.
Red Box: Different sections of parts. Each Section contains different parts for your car
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The Dealership Screen:

Red Box: Car information including specifications
Green Box: Shows the membership needed to buy the cars, which some are open for bronze members.
Light Blue Box: Price (Stock) it costs, and the "Buy" button to purchase the car.
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The Challenges Screen:

Light Yellow Box: Displays the "NEW" Challenges icon, which means you have results from your outgoing races or a new incoming race.
Red Box: Search For a user by name, Car or Dial in.
Light Blue Box: The challenges box where races are seen as outgoing or incoming.
Pink/Purple Box: Racers name, and elo.
Green Box: Car showing information (team/record/win-loss ratio), also "Challenge" button used to send a challenge to someone.
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The Teams Screen:

Green Box: Your team section (only shown when you are leader/part of a team)
Red Box: Team search list, which displays up to 200 teams.
Blue Box: Displays team name, win-loss ratios, team leader and members. And if not on the team and a leader of another there will be a "Challenge" screen at the top right of this box OR if you are not a member of a team there will be a "Join" button.
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The Tournaments Screen:

Yellow Box: Create tournament button, which allows you to adjust entry fee, public/private tournament, and what cars are allowed etc.
Red Box: List of Tournaments already been created
Green Box: Individual tournament details including entry fee.
Pink/Purple Box: Shows already completed tournaments or tournaments which are still being done.