The premise of Dirtring is for the player to reach a total of 32 checkpoints scattered around an arena-sized area containing ramps, wrecks, walls, and a dirt track using a Sanchez dirt bike; many of the checkpoints are located at places typically hard to reach using a motorbike, requiring the player perform stunts (loop-the-loops and jumps over wrecks or rings of fire) or ride along thin ledges or planks to reach a checkpoint in an elevated position.
Because there is no time limit (although the player's run is timed), the player may choose to complete the side-mission at their own pace; completion of the side-mission at any time is essential for 100% completion. If the player is dismounted from their bike, the player has 30 seconds to return to it, or the player fails the side-mission; the player may also walk to a halo in the middle of the course to end the side-quest.
If the player succeeds in reach all checkpoints in 5 minutes, the player will be awarded $50,000. If the player reaches all checkpoints from 5 to 10 minutes, he will be awarded $10000. If the player reaches all checkpoints in more than 10 minutes, he will be awarded $5000.
There is one known glitch with the mission in that if you park close enough to the Hyman door that you are drawn into the mission by getting out, if you push the enter vehicle button right after getting out and activating the mission; you will begin to get into your vehicle again and you will appear in the mission inside the vehicle you had outside.