Board Thread:News and Announcements/@comment-25404524-20161029094134/@comment-24577221-20161220060804

It's what the Windows game displays if it can't find an image file. I expect it's the same for other versions. If I remember correctly, what you get is a bunch of checkerboard-pattern rectangles, each replacing one segment of the monster's body in the same way that the image bits are usually combined to create the complete image. I assume that this is because the game has a file which tells it what coordinates on the big image sheet define each bit, as a rectangle, and instructions on how to position the pieces relative to each other, and how they move. So it's what you'd see for any monster if its image file is deleted/renamed/moved so it can't be found, or corrupted, or locked so it can't be read.