Harstein is among the Age of Empires II players representing France. Harstein has competed in 857 Age of Empires II matches so far. When picking Malians, Harstein achieves a 57.6% win rate over 33 games.

On Nomad, Harstein wins 56.4% of the time (55 matches). Harstein excels in the pocket position: 53.2% win rate over 79 matches. Harstein carries an ELO of 1029 on the RM 1v1 ladder.

Harstein wins 50.0% of the time in RM Team after 176 matches.