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An example of a CAPNTHLA challenge used in this wiki.

CAPNTHLA is an acronym for "Completely Automated Public NetHack Test to tell 'Hackers and Losers Apart". It is a highly specialized form of CAPTCHA.

Item/feature CAPNTHLA

This is the only type currently extant. The user is presented with the name or a description of an item class, dungeon feature or monster and is required to input the ASCII character used to represent it in the default configuration of NetHack. This slightly discriminates against tiles users, but seems to be fairly effective.

Example usages