In addition to Mölndals HF, 17 other teams from 8 different countries played in Boys 21. They were divided into 3 different groups, whereof Mölndals HF could be found in Group 3 together with Århus Håndbold, TV Birsfelden, Tsinghua University, Tyresö Handboll and Backa HK. Mölndals HF made it to B-Play-off after reaching 4:th place in Group 3. Once in the playoff they made it all the way to the Final, but lost it against GIK Wasaiterna with 16-17. Thereby Mölndals HF finished second in B21 B-Play-off during Partille Cup 2013.