All Game Modes...
	Arcade 2600 Game Challenges...
	Asteroids: Second dimension sh...

To unlock all game modes, enter the following code at the title screen: Hold Down on the D-Pad and press X + Triangle followed by Start.

Score the required amount of points for each Arcade Games Challenge to unlock the Games Challenges.

Challenge	How to unlock
3D Tic Tac Toe challenges	Pong - Trippy (exceed oppenent by 6 points)
Adventure's challenges	Asteroids Deluxe - Double Speed (15,000 points)
Air-Sea Battle's challenges	Major Havoc - Hot Seat (60,000 points)
Asteroids' challenges	Asteroids - Trippy (10,000 points)
Atari Video Cube's challenges	Liberator - Trippy (8,000 points)
Backgammon's challenges	Centipede - Time Warp (17,000 points)
Battlezone's challenges	Battlezone - Time Warp (5,000 points)
Black Jack's challenges	Red Baron - Double Speed (2,500 points)
Bowling's challenges	Major Havoc - Time Challenge (24,000 points)
Breakout's challenges	Gravitar - Time Challenge (6,000 points)
Canyon Bomber's challenges	Major Havoc - Double Speed (35,000 points)
Casino's challenges	Space Duel - Time Warp (10,000 points)
Centipede's challenges	Centipede - Hot Seat (30,000 points)
Circus Atari's challenges	Pong - Time Warp (exceed oppenent by 1 point)
Combat's challenges	Red Baron - Time Challenge (1,400 points)
Crystal Castles' challenges	Crystal Castles - Trippy (10,000 points)
Demons to Diamonds' challenges	Space Duel - Hot Seat (20,000 points)
Desert Falcon's challenges	Asteroids - Hot Seat (20,000 points)
Dodge 'em's challenges	Asteroids Deluxe - Trippy (15,000 points)
Double Dunk's challenges	Millipede - Hot Seat (35,000 points)
Flag Capture's challenges	Battlezone - Double Speed (5,000 points)
Football's challenges	Missile Command - Trippy (10,000 points)
Fun with Numbers' challenges	Lunar Lander - Double Speed (400 points)
Golf's challenges	Pong - Double Speed (exceed oppenent by 3 points)
Gravitar's challenges	Gravitar - Double Speed (10,000 points)
Hangman's challenges	Gravitar - Hot Seat (10,000 points)
Haunted House's challenges	Lunar Lander - Time Challenge (100 points)
Home Run's challenges	Red Baron - Time Warp (2,000 points)
Human Cannonball's challenges	Black Widow - Time Warp (20,000 points)
Math Gran Prix's challenges	Major Havoc - Time Warp (30,000 points)
Maze Craze's challenges	Millipede - Time Challenge (15,000 points)
Millipede's challenges	Millipede - Trippy (30,000 points)
Miniature Golf's challenges	Space Duel - Time Challenge (6,000 points)
Missile Command's challenges	Missile Command - Double Speed (7,500 points)
Night Driver's challenges	Missile Command - Time Challenge (2,500 points)
Off-the-Wall's challenges	Centipede - Time Challenge (18,000 points)
Outlaw's challenges	Crystal Castles - Hot Seat (15,000 points)
Quadrun's challenges	Tempest - Hot Seat (10,000 points)
Radar Lock's challenges	Gravitar - Trippy (15,000 points)
RealSports Baseball's challenges	Warlords - Double Speed (800 points)
RealSports Football's challenges	Tempest - Trippy (7,500 points)
RealSports Tennis' challenges	Battlezone - Trippy (10,000 points)
RealSports Volleyball's challenges	Super Breakout - Hot Seat (70 points)
Skydiver's challenges	Liberator - Double Speed (7,000 points)
Slot Machine's challenges	Super Breakout - Time Challenge (45 points)
Slot Racers' challenges	Warlords - Trippy (1,000 points)
Space War's challenges	Pong - Hot Seat (50 points)
Sprintmaster's challenges	Asteroids - Time Warp (10,000 points)
Star Raiders' challenges	Black Widow - Trippy (30,000 points)
Star Ship's challenges	Centipede - Double Speed (20,000 points)
Steeplechase's challenges	Asteroids Deluxe - Time Challenge (11,000 points)
Stellar Trek's challenges	Crystal Castles - Time Warp (15,000 points)
Street Racer's challenges	Battlezone - Hot Seat (50,000 points)
Submarine Commander's challenges	Lunar Lander - Time Warp (200 points)
Super Baseball's challenges	Asteroids - Time Challenge (8,000 points)
Super Breakout's challenges	Super Breakout - Trippy (60 points)
Super Football's challenges	Asteroids Deluxe - Hot Seat (35,000 points)
Surround's challenges	Missile Command - Hot Seat (15,000 points)
Swordquest: EarthWorld's	Black Widow - Time Challenge (10,000 points)
Swordquest: FireWorld's challenges	Liberator - Time Warp (5,000 points)
Swordquest: WaterWorld's challenges	Lunar Lander - Trippy (300 points)
Video Checkers' challenges	Millipede - Time Warp (40,000 points)
Video Chess' challenges	Crystal Castles - Time Challenge (13,000 points)
Video Olympics' challenges	Black Widow - Double Speed (25,000 points)
Video Pinball's challenges	Liberator - Hot Seat (8,000 points)
Warlords' challenges	Warlords - Time Warp (700 points)
Yars' Revenge's challenges	Tempest - Double Speed (6,000 points)

You must be at the side top or bottom of the screen. Then, shoot towards that part of the screen. Watch the opposite screen to see your shots come through. Note: This works best when a asteroid is on the opposite side, as you will have a chance of exploding it.