Puzzle solved in game mode (6)

I believe the answer is:

enigma

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'puzzle solved in game mode' is the definition.
'enigma' can be an answer for 'puzzle' (I've seen this in another clue). I am not sure about the 'solved in game mode' bit.

'in game mode' is the wordplay.
'mode' is an anagram indicator (another mode or version of the letters).
'in'+'game'='ingame'
'ingame' with letters rearranged gives 'ENIGMA'.

Can you help me to learn more?

(Other definitions for enigma that I've seen before include "'Puzzle, riddle (6)'" , "Gamine being a bit of a puzzle" , "WW2 code" , "It's mysterious, difficult to understand" , "Mysterious puzzle" .)

I've seen this clue in the Sydney Morning Herald.

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