The King of Fighters 2003 was developed and published by SNK Playmore, released for arcades in 2003 as a significant structural overhaul of the series, replacing the traditional fixed three-character teams with a rotating tag system where any of three selected fighters could be swapped in in real time during a match. This tag mechanic let players build combos that spanned multiple characters and required more dynamic team-composition strategy than earlier entries, where teams simply fought in a fixed sequence one after another. It also introduced Leader and Support character roles with distinct gameplay bonuses depending on team position, adding another strategic layer to team-building beyond just picking strong individual characters. Marking a deliberate shift toward faster, more technical team-based combat, King of Fighters 2003 is often cited as a turning point for the series heading into its later Climax-era entries, and remains well regarded by competitive players for the depth its tag system added to team strategy.