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1) Chris Sawyer wrote Transport Tycoon and RollerCoaster Tycoon in assembly. 2) SerenetyOS started off as a one man project by Andreas Kling.

• pringk02 4y ago
  1st was exactly what I thought of. One or the other would have been monumental, never mind both!
• Gigachad 4y ago
  For games, I believe Stardew Valley was a one man effort including all art and music.