g4 was a mistake because White missed winning a piece. The Knight at c6 was free to grab as Black cannot take the Bishop at f4 as the Knight at c6 will then take the Black Queen.
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So I've done this Intuition problem over on Aimchess and unlike normal it hasn't done the green arrow to show why a move was a mistake and after looking at it for about 10 mins I really can't see what the problem with the move is so hoping someone could explain it to me
r1bq1rk1/5ppp/p1nbpn2/1p1pN3/3P1BPP/2PB1P2/PP1NQ3/R3K2R b KQ g3 0 4
White has just played g2-g4 and it was a Black to play puzzle (if that matters)