Chaos GP is the main one-player game mode in Sonic Drift and Sonic Drift 2. In this mode, the player competes against three other computer-controlled racers in a series of six races on six different courses.
The Chaos GP is a gameplay mode where the player races against three other computer-controlled competitors in a series of six races. Each game has three separate circuits for the Chaos GP (named after a color) with each featuring six different courses that they player is taken through. No racing track on the courses in the circuits is the same, even when the course in question is reused in another circuit; instead, the courses may hold alternate racing track for each circuit. At the end of each race, each racer is awarded with an amount of points based on his/hers finishing position:
- 1st Place: 3 points
- 2nd Place: 2 points
- 3rd Place: 1 points
- 4th Place: 0 points
After the six races in the chosen circuit has been completed, the racer who has amassed the most points wins the Chaos GP. If there is a tie for total points, the racer with the most 1st-place finishes wins. When winning the Chaos GP, the player is awarded with a Chaos Emerald.
The Chaos GP is the main gameplay mode for the single-player in Sonic Drift and Sonic Drift 2, where the objective is to win each of the circuits available in the Chaos GP in order to complete the game.
In Sonic Drift, the Chaos GP mode feature the first three known circuits (green, yellow and red). In this game, the player is taken through all six available courses in the following order in each circuit:
For each circuit, each course has a different racing track for the circuit in question, giving a total of eighteen racing tracks in the game. After completing the green and yellow Chaos GP, the player is awarded with a bonus screen for winning, but it is only after completing the red Chaos GP in first place that the player will access the ending and credit roll of the game.
Sonic Drift 2
In Sonic Drift 2, the Chaos GP feature three new circuits, each with a different difficulty (purple = easy, white = medium, blue = hard). In this game, each circuit in the Chaos GP features a different set of six courses that the player has to go through. Those courses that are reused in a circuit however, feature an alternate racing track different from the earlier one. Those racers that places first in each of the different races on the circuits is awarded with a Chaos Emerald.
Purple Chaos GP
These are the courses, in order, which the player must complete in the purple Chaos GP:
White Chaos GP
These are the courses, in order, which the player must complete in the white Chaos GP:
Blue Chaos GP
These are the courses, in order, which the player must complete in the blue Chaos GP:
Final Chaos GP
The Final Chaos GP is a secret circuit that is unlocked when the player collects all six Chaos Emeralds in the Blue GP, which is done by finishing in first place on all the courses. Here, the player enters a one-on-one race on the Death Egg, with the opponent being determined by the player's chosen character as that side's "leader". If playing as Sonic, Tails, Amy, or Knuckles, the player will race against Dr. Eggman. If playing as Eggman, Metal Sonic, or Fang, however, the player will race against Sonic.
- The "GP" in "Chaos GP" stands for "Grand Prix".
- It should be noted that in both Sonic Drift and in Sonic Drift 2, the light-blue Chaos Emerald is the only colored emerald not awarded to the player in either of the games.