(Characters I haven't personally revealed have been burnt out in this screenshot)
B) CHARACTER SELECTION MENU
The same principles as for the menu lie with selection as well, you move the hand to select the character you want.
In Vs. Player Mode, the other player will control their hand with WASD control (using the W, A, S, and D keys as the Up, Left, Down, and Right arrow keys).

In both, you can select the character you wish to play as by pressing the SPACEBAR when both hands are over the desired character(s).

(Again, any stages I haven't personally revealed have been burnt out)

C) STAGE SELECTION MENU

Like in the Character Selection Menu, you once again move the hand to select the stage you want to play in. Once you have the desired stage highlighted, press SPACEBAR.

IN BOTH THE CHARACTER AND STAGE SELECTION SCREENS, YOU MAY RETURN TO THE MAIN MENU BY PRESSING THE BACKSPACE KEY!

D) GAMEPLAY

A) The time remaining until the game ends

B) The first player, or the person on the right. This player controls their character by using the left and right arrow keys to steer. Press down to brake. When you brake, you will also charge up a "Boost" so you can go faster, sometimes faster than before!

C) The second player, or the person on the left. This player controls their character by using the A and D keys to steer. Press S to brake. When you brake, you will also charge up a "Boost" so you can go faster, sometimes faster than before!

D) The second player's information. Here, you can see the second player's currently held item (in the above screenshot, they are not holding any); the steering wheel, which denotes what direction the player is going in; the damage percentage (in the above screenshot, they have it at 7%); and "Limit" (which hasn't been achieved yet in the above screenshot). When the second player has an item, s/he should press the W key to use it. When they get "!!!", s/he should double tap S to initiate the selected character's special attack.

E) The first player's information. Here, you can see the first player's currently held item (in the above screenshot, they are holding the R1 summon); the steering wheel, which denotes what direction the player is going in; the damage percentage (in the above screenshot, they have it at 92%, close to losing!); and "Limit" (which has been achieved in the above screenshot and is being denoted with a "!!!"). When the first player has an item, s/he should press the Up arrow key to use it. When they get "!!!", s/he should double tap the Down arrow key to initiate the selected character's special attack.

F) Press Spacebar to pause game. At any moment during the game, press ESC to quit playing the game and return to Windows. (Yeah, I know "F)" isn't on the screenshot above!)

H) Item/ Summon Stones: These are the stones players should chase after to try and damage the other player's vehicle. There's a great variety of stones already and not all do the same things.

G) Winning: This shows who is currently winning the match. When no one is winning, there are no arrows pointing to any player. When someone is clearly winning, like in the above screenshot, an arrow is shown. The winning player is not the one with least amount of damage, but the one who has been destroyed the least.

E) Winning

You win if you manage to defeat your opponent the most in the allocated time. Once time is over, you will be shown this screen with the results... In a battle between Master Chief and Master Chief... It seems Master Chief won... O_o