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This means it might contain formatting issues, incorrect code, conceptual problems, or other severe issues.

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"Perverse" problems, that place some arbitary handicap on the programming.


  • Source must be in uppercase only : [[Calendar - for "real" programmers|CALENDAR]]
  • Not allowing certain datastructures: strings/arrays/... : [[Odd word problem]]
  • Restricted I/O
  • No comparisons, arithmetic, no lists, no re-reading of input : [[Longest string challenge‎]]
  • [[Code golf]] challenges : [[Game of Nim]]
  • The task to be solved depends on the source of the program itself : [[Quine]], [[Narcissist]] ...

'''See also:''' [http://rosettacode.org/wiki/Category:Excessively_difficult_task Category:Excessively difficult task]