LittleBigPlanet Karting/Milestone 4

The August 15th, 2011 prototype of LittleBigPlanet Karting, dubbed Milestone 4, was dumped and released to the public on December 25, 2023 as part of the Imagisphere 2023 Mega Release event. It is a very early version of the game which contains many visible remnants from United Front's previous game ModNation Racers, ranging from leftover models and UI elements to entire game mechanics, systems, and even a handful of remnants from its unrealised sequel.

While the disc's label claims a date of August 30th, 2011, the build's DATESTAMP.DAT file — as well as the disc's primary volume descriptor — suggests the data is actually from August 15th. Unsurprisingly, the game is very incomplete at this point of development, with broken customisation options and numerous graphical oddities. A Story Mode is available, and though a lot of the levels are either unfinished or blatant placeholders, the basic layouts for a handful of tracks and arenas are complete