Mistake Of Pythagoras

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This mod for Source has been released! Download it now.


Single player mod from the (co)author of Sweet Half-Life and Peaces Like Us.

You are Gordon in a parallel world and the city is under attack from unknown enemies. You have to find out a way to stop the invasion by traveling into their world and correcting the "mistake."

You'll experience unique single player experience spanning 3 chapters, 10 maps.



After finishing Sweet Half-Life project, Koumei Satou became a contract level designer for Namco's LEDZone project (Counter-Strike Arcade). It's safe to say he was the first professional level designer in Japanese game industry history.

When Half-Life 2 was released, he started many experiments with entities at home (LEDZone doesn't use Source Engine). Then he began to work on this mod without a whole picture. He made it map by map from chapter 1.

He did everything alone in Hammer and FacePoser without any coding. It took 9 months to complete. "I had been very busy at work, so I could only use 2-3 hours a day this time.", he says.

After these months of silence (He didn't tell anyone that he was making a mod.), he called some testers from C-SEC - the Japanese HL2 mod community. One coder added chapter unlocking codes, but other parts are untouched.

You can do anything you saw in this mod with entities.


Koumei Satou - Concept, Level design, everything


  • Ranked #12 mod of 2005 by Mod DB.

Other info