The Lost Media Wiki’s article on the subject!

In 2001, Post/Kraft created a website called Postopia. It was a website where people could play games featuring cereals like Fruity/Cocoa Pebbles, Honeycomb, Golden Crisp, Oreo O’s, etc. In 2003, along with a new logo, the website was updated to include "Postokens". Postokens were codes that were printed on marked boxes of Post Kids’ cereals (like the mentioned, Fruity/Cocoa Pebbles, Honeycomb, Golden Crisp, etc.) that users could enter on the website if you had an account. These codes would give people stuff like exclusive mini-games (one example being the dunk tank game in Big Barney Chase), cheats, extra levels, etc. In 2011, Postopia was shut down, and replaced with PebblesPlay.com. When that happened, a lot of the games on the website were not included on the new site (although, many other game websites archived them before PebblesPlay.com was around).

Availability

Some Postopia games are still available to play from other sites, but not all of them. Most of Postopia's games were lost after the move, probably the Wayback Machine did not archive all of the games, so most of the game files are missing. Postopia was the property of Ralcorp, the company that bought Post Cereals from Kraft, but they were in turn purchased by Treehouse Brands.

Between October 11th and October 13th, 2019, a Dev going under the username nightpearl gave the Advergame Recovery Project Discord server a google doc containing 43 lost games.[1]

Games

Partially Found/Found Postopia Games Game Title Status Notes Asteroid Avalanche Found N/A Be A Popstar Found N/A Bedrock Bobsleddin' Blowout Found N/A Berry Pebbles Bumper Pool Found Wayback Machine Big Barney Chase Found N/A Bobblehead Creation Zone Found Wayback Machine Bronk's Jungle Adventure Found N/A Bronk's Sky Glide Challenge Found N/A Cafeteria Caper Found N/A Camp Dino Capture the Flag Found N/A Camper's Canoe Found N/A Cocoa Pebbles Boulder Dash! Found N/A Cocoa Pebbles Super Cocoa Man Found N/A Craver's Slurp & Slide Found Wayback Machine Craver's Snowboard Jam Found Wayback Machine Crunchtime Found Wayback Machine DJ @ the Starfish Lounge Found N/A E.T. Phone Home Found Wayback Machine Fruity Pebbles Beach Break Found N/A Fruity Pebbles Fruity Pool Found Wayback Machine Fruity Pebbles Spy Caper Found N/A Game Frame Partially Found Missing ppdamain.cct Honeycomb Big Rock Show Partially Found Unplayable prototype found. Honeycomb Factory Frenzy Partially Found Missing loader. Honeycomb Stunt Bike Found Wayback Machine Honeycomb Havoc Found N/A Honeycomb Monster Truck Partially Found Missing some files. Hysterical History Found N/A Ice Burbs Frozen Bowling Found Wayback Machine Justice League Builder Found N/A Kiki's Dream Room Designer Found N/A Kiki's Extreme Polar Ice Caps Partially Found Missing assets. Kiki's Polar Challenge Found N/A Kiki's Polar Ice Caps Found N/A Know It All Ball Partially Found Missing triviaquestions.xml. Make It, Skate It Fashions Found N/A Marching Monkeys Found N/A Marshmallow Mania Pebbles: The Great Gazoo Space Chase Found N/A Mission Match Up Found N/A Monkey Huts Found N/A Mor Fits Farm Found N/A Mor Fits Quest Found N/A Nick's Ocean Quests Partially Found Missing some files. Nick's Octo Hockey Found N/A Night Spy Mission Partially Found Missing some files. Oreo O's Creme Team Journey Found N/A Oreo O's Extreme Creme Control Found Oreo O's Flying Disc Toss Found Wayback Machine Paint a Bronto Found Wayback Machine Passport to the World Partially Found Missing some files. Pebbles and Bamm-Bamm’s Bedrock Dance Academy Found N/A Pebbles Bedrock Snowball Bash Found N/A Pebbles Dome Reefball Found Wayback Machine Pebbles Popstar Found N/A Pebbles Quarry Adventure Found Wayback Machine Pebbles Robopup Run Found Wayback Machine Pebbles VidRock Found N/A Pop Fly Challenge Found Wayback Machine Postopia Cereal Factory Pinball Found N/A Postopia Food Fling Found Wayback Machine Postopia Miniature Golf Found Wayback Machine Postopia Power Play Found N/A Postopia Speedway Challenge Found N/A Shop, Don't Drop! Found N/A Slurp & Slide Found Wayback Machine Sonic Scoop Partially Found Missing files. Space Nation Pilots Partially Found Lost version with robot in replacement of Chelsea. Stadium Soccer Showdown Found N/A Stealin' Home Found Wayback Machine Strawberry Blasted Factory Frenzy Partially Found Missing main file. Strawberry Blasted Sky Glide Found N/A Sugar Bear's Wacky Waterskiing Found N/A Sugar Bear's Beach Break Found N/A The Great Cocoa Chase Partially Found Missing many files. The Polar Express Train Adventure Found N/A The Postopia Adventure Found Wayback Machine The Ultimate Party Kit Partially Found Missing some files. Ultimate Baseball Found Wayback Machine Waffle Boy's Jungle Adventure Found N/A Waffle Boy's Mountain Adventure Partially Found Missing Waffleboy.xml Whack-y Ballgame Found N/A Zander's Robotopia Found N/A Zander's VertJam Skateboarding Found Wayback Machine Pebbles Cereals Game Title Status Adventure Beneath Bedrock Lost Brontos on the Loose Lost Fruity Pebbles PebPals Lost Fruity Pebbles Bedrock & Roll Lost Lair of the Cocoa Dragon Lost Mt. Pebbles Snowboard Dash Lost Post Pebbles Cereal PebPals Lost Honeycomb Game Title Status Bernard's Honey Pursuit Lost Big Mouth Life Lost Grind & Grab Lost Honeycomb Blastoff Lost Taste and Tell Poll Lost Alpha Bits Game Title Status Mystery of Sector Alpha Lost Other Postopia Games Game Title Status Big League Bobble Lost Bronk's Mountain Adventure Lost Clamshell Shoot Lost Monster Rumble Lost Rocket Skate Relay Lost Satellite Slam Lost Snowball Catch-All Lost The BATMAN Training Academy Lost Xiaolin Showdown Lost Zander's Robopets Lost Zander's Wild Time Rescue Lost ZWTR2: Land of Dinosaurs Lost