Eight teams were featured in the playoffs. Fnatic, G2 Esports, Luminosity Gaming, Natus Vincere, Ninjas in Pyjamas, Team EnVyUs, Team SoloMid, and Virtus.pro – all Legends from the last major – were once again Legends as no Challenger took their spots. Team EnVyUs, which defeated Fnatic and G2 Esports, was the winner of the event, defeating Natus Vincere, which defeated Luminosity Gaming and Ninjas in Pyjamas, in the finals, 2–0. This came after Team EnVyUs placed second at the previous major, including a game in which Fnatic came back from a large deficit in the first game of grand finals.[1][2]
The top eight teams from ESL One Cologne 2015 ("Legends") received direct invitations to Cluj-Napoca. This was the first Major to fill the other eight Major spots from a single Major qualifier, instead of directly from various regional qualifiers. For the Cluj-Napoca Major cycle, the regional qualifiers sent teams to DreamHack Open Stockholm 2015, where they faced off against the bottom eight teams from Cologne 2015. The top eight teams from DreamHack Open Stockholm 2015 then advanced to the Major as the "Challengers"
Teams were split up into four groups, and all group matches were best-of-ones with the exception of the final decider match. The highest seed would play the lowest seed in each group and the second and third seeds would play against each other. The winner of those two matches would play each other to determine which team moved on to the playoff stage, while the losers of the first round of matches also played. The loser of the lower match was then eliminated from the tournament. With one team advanced and one eliminated, the two remaining teams would play a best-of-three elimination match for the second playoff spot. This format is known as the GSL format, named for the Global StarCraft II League.[3]
The playoffs bracket consisted of eight teams, two from each group. All of these matches were best-of-three, single elimination. Teams advanced in the bracket until a winner was decided.
The seven-map pool did not change from Cologne 2015. Before each best-of-one match in the group stage, teams alternated banning maps until five maps had been banned. One of the two remaining maps was randomly selected, and the team that that did not get a third ban then selected which side it wanted to start on. In all best-of-three series, each team first banned a map, leaving a five-map pool. Each team then chose a map, with the opposing team selecting which side they wanted to start on for their opponent's map choice. The two map picks were the first two maps in the best-of-three. If the series were to require a third map, the map was randomly selected from the three remaining maps.
Two teams from the first European qualifier moved on to the major. Eight teams that were eliminated in the said qualifier moved to the second European qualifier. Three teams from that qualifier moved on to the major. Two teams from the North American qualifier moved on to the major and one team from the Asian qualifier moved on to the major.
The 16 teams at the major qualifier played at DreamHack Open Stockholm 2015. The bottom eight teams from ESL One Cologne 2015, five teams from two European qualifiers, two teams from the North American qualifier, and one team from the Asian qualifier.
Teams were divided into four groups and the top two from each group made it to the major.
^The Asia Qualifier champion, QeeYou, had passport issues and could not attend. Skyred was the runner-up of the qualifier and took its place at the main qualifier.
Team EnVyUs won its first title. kennyS and apEX had their first major title and NBK-, kioShiMa, and Happy won their second title, their first being with Team LDLC.com at DreamHack Winter 2014.