I was looking into it and it looks like a lot of level maps in 3d land are lacking color in their textures and appear white for some reason.
A "texture" is data that contains an image, color and usually has lighting stuff like how shiny the object is. Textures get put on all the surfaces in the game. That is why the ground appears "snowy", because that texture is missing color. This probably happened when someone was ripping the levels from the game.
Here's an example of Special 8-Crown. All of the blocks appear white because the textures are missing color.