Harstein is among the Age of Empires II players representing France. Harstein has competed in 714 Age of Empires II matches so far. When picking Malians, Harstein achieves a 57.6% win rate over 33 games.

On Nomad, Harstein wins 58.3% of the time (36 matches). Harstein excels in the pocket position: 52.6% win rate over 76 matches. Harstein carries an ELO of 946 on the RM Team ladder.

Harstein wins 49.5% of the time in RM Team after 107 matches.