This is one time that I'm glad that I had trouble sleeping. What a level, Kiki! You keep coming up with very challenging and entertaining ideas. Thanks for another fun, fun level!
There doesn't seem to be enough prisms to blow enough boxes, but then I've never been very good with prism puzzles - most of your prism series are in my CAN'T DO folder, Keeks.
The texture should go in the "CustomTextures" folder, which is in the "Return To Wonderland" folder, just like the "CustomLevels", "CustomModels" folders etc.
But be sure to unzip the "factory.zip" file first, so you put the "factory" folder into that "CustomTextures" folder.
You don't need the texture if you don't want to. Then the woodtexture appears.
Also levelmakers use to add the word "Adv" to the topictitle which means there's a customtexture involved. And when they attach a zip file beside the level it's usually a texture. So what's not clear?
I am well aware that you don't HAVE to use a texture. What isn't clear is that the post doesn't specify whether the zip file is a Background, a House, a Model, or a Texture so that I will know what folder to extract it toi.
Well , my advise is: Next time you see someone posted a level with only one zip-file added, not saying what it is; be 99% sure it's a texture.
For there are many levelmakers using textures, not so many using models/backgrounds, and I don't remember that I've seen anyone using models/background/houses, but not using a texture.