The source code for Ocean Software’s Mr Do! port to the gameboy has been officially released by two of the original developers. Description from Paul Hughes 1
Many moons ago I debugged and finished off Ocean's Mr Do! for the original Gameboy.
As Joffa, the late, great original author, decided to release the source code,
I thought I'd also put it up.
The header for the source file also mentions Wesley Knackets developed it between the 28th of June and the 5th of September 1990, which is just a little over 2 months!
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* MR DO! (C) 1990 SPECIAL FX SOFTWARE LIMITED *
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* BY WESLEY KNACKERS *
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* START DATE 28/06/90 *
* LAST DATE 05/09/90 *
* *
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Known developers:
It was started on Special FX’s own Gameboy assembler and hardware and was finished on Ocean’s own Atari ST based assembler and hardware.
— Paul Hughes (@PaulieHughes) February 22, 2020
http://www.pauliehughes.com/downloads/index.html ↩