In addition to Gunnilse IS, 141 other teams from 26 different countries played in Boys 13. They were divided into 35 different groups, whereof Gunnilse IS could be found in Group 11 together with Tynecastle Football Club, Billesholms GIF 1 and Skedsmo 2. Gunnilse IS continued to Play off B after reaching 3:rd place in Group 11. In the playoff they made it to 1/16 Final, but lost it against JSG Mitte NF with 0-1. In the Final, Syrianska FC won over TSV Neudorf-Bornstein and became the winner of Play off B in Boys 13. Gunnilse IS also participated in Boys 12 during Gothia Cup 2013. They reached the 1/16 Final in B12 Play off B, but lost it against Ekerö IK 2 with 2-3.