User blog comment:Unfortunate Mermaid/A Guide to Articles./@comment-24883907-20120318162331

There's a problem with your standardized 600x600: The game's window stretches out only to 400x400. If I were to recreate a 600x600 image, I'd have to go into fullscreen and then the image's pixels would be distorted. Then shrinking the image would look even worse.