Silverain Plays: Dino Run DX: Planet D & Halloween Hell Run
Edit: My Mistake the original Web version was 2008 not 2006 but I wasn't far off.
Lurking in my Steam Library forgotten by time Dino Run DX: Escape Extinction is the ongoing evolution of the classic prehistoric multiplayer racing game. The original Web version created by Pixeljam in the mid 2000s has been improved upon in every way with more levels, hats and gameplay options. If you've played Dino Run SE, the major differences are completely redone backgrounds and an extra layer of polish, true fullscreen mode, controller support, steamworks integration, improved multiplayer security, freerun mode, and many, many more hats and colors to choose from.
Steam Page: https://store.steampowered.com/app/248330/Dino_Run_DX/
The ongoing work for Dino Run 2: https://www.pixeljam.com/dinorun/#summary