[Evan]

http://www.snescentral.com/review.php?id=0285&num=0&fancy=yes&article=proto

Alas, I only have 3 of the the required six chips for this prototype. I was able to extract the game script, though. Clearly these chips are from an early version of the game.

[Skrybe]

Have you tried merging the data from individual chips with the retail version, rather than all three chips at once? The result might be more stable that way.

[Evan]

I did try that, but with no result. You just look at it in a tile editor, and it is clearly very different from final, to the point that it cannot be merged.