And since Microsoft's source code is secret, outside software developers cannot debug it.

ECONOMIST: Microsoft

If there was a Basic program that was written with the complexity of the IRC, I am sure that not only would the program not have worked, but if from this moment forward, no new features were added to it and all programming effort was devoted to debugging the existing code, it would certainly take centuries to debug.

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By rewriting the game's code during "debug mode" AzzerUK turned off the game's disconnect timer so it never checked whether it was online or offline.

BBC: Gamer hacks SimCity to run offline