Some experimental versions of Mystery City were released:

• MSX1 - requires disk drive system. 
• ZX Spectrum 48k/128k - requires an ESXDOS compatible interface
• Commodore 64 - requires disk drive system.
• Web - uses the WebMSX emulator. Click here to play on-line.

They are already playable and, except the web version which is based on MSX2, other versions  are text only and still work in progress. If you have one of these computers, hope you enjoy it and report any bugs or problems. Thank you very much for your support!

Best regards,
Rogério