Well I tried wiping the card and starting over (all my scores lost...
) It didn't do anything. Smash and Crash still won't work. I do just need the .inf and .hex files, right? Not the .elf? Perhaps I even need to just put the full master zip file on.
[EDIT] Apparently Gamebuino is really picky about whether a file ends like .hex or like .HEX. It works fine once you rename it to SMSHCRSH.HEX. By the way, the black hole is almost impossible to see and escape before you're dead. You might want to make it a little slower.