In addition to Gunnilse IS, 162 other teams from 31 different countries played in Boys 12. They were divided into 40 different groups, whereof Gunnilse IS could be found in Group 17 together with Florø SK 2, Munka-Ljungby IF 2 and South Central FC 1. Gunnilse IS continued to Play off A after reaching 2:nd place in Group 17. In the playoff they made it to 1/64 Final, but lost it against Kälvesta IoF with 2-3. In the Final, IFK Stocksund Blå won over Florø SK 1 and became the winner of Play off A in Boys 12. Gunnilse IS also participated in Boys 11 during Gothia Cup 2013. They reached the 1/32 Final in B11 Play off A, but lost it against Aalborg Chang 1 with 2-3.