I went and put a Mode 7 previewer online, after improving it a little:http://t.novasquirrel.com/test/mode7/https://github.com/NovaSquirrel/Mode7Preview
Lemme know if there's any anyway I could improve it. I can think of a few things that would be nice, like support for animation.
I fixed a bug involving negative numbers, and added an animation feature. Here's some rotation:
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