Brainteaser in game, puzzling (6)

I believe the answer is:

enigma

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'brainteaser in game puzzling' is the definition.
I know that 'puzzling' relates to this answer.

'in game puzzling' is the wordplay.
'puzzling' indicates anagramming the letters.
'in'+'game'='ingame'
'ingame' is an anagram of 'ENIGMA'.

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(Other definitions for enigma that I've seen before include "Riddle - German coding machine" , "Something mysterious and puzzling" , "German military cipher machine" , "Solution to mystery" , "Mysterious puzzle" .)

I've seen this clue in The Hindu.

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