Pringles Pony Express (found 3D Groove online game; 2002)
From The Lost Media Wiki
Pringles Pony Express was a 2002 online game that ran on the 3D Groove engine.
Another game on the Pringles website, running on the same engine, was called Pringles: Super Spud Boxing, but unlike Pony Express, is still available while the other is lost.
When going back to the game's adress on the Wayback Machine, a Shockwave logo appears but never fully loads.
Plot
Even though the game is lost, there is a plot written on both the Pringles website and 3D Groove site on the Wayback Machine. The summary reads:
"Buckle your saddle, 'cause you'll be racing through canyons and prairies to deliver those dang tasty new Sweet Mesquite BBQ Pringles. Gather up a posse and invite your friends to play along."