This tag exists for historical reasons. New challenges of the type previously posted under this tag are not welcome.

NOTE: This tag exists for historical reasons. New challenges of the type previously posted under this tag are not welcome. See here

An underhanded challenge is a challenge to write a program that looks as if it is doing one thing, but does something else. For example, a program that outputs the digits of pi up until the 100th decimal place, when it does something else, might be underhanded if it conceals its doing so.

Votes cast on challenges should take into account how well (or poorly) hidden the bug is.

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