The King of Fighters '98: Ultimate Match Online is a multiplayer strategy and card-battler game in which players collect and build decks featuring characters from the iconic fighting series, engaging in turn-based battles that require strategic planning and card management. In this game, the setting is a universe where fighters from various teams compete in a tournament to determine the strongest, with the storyline revolving around the legendary fighters' quest for supremacy and their personal rivalries. It stands out with its unique blend of classic fighting game characters integrated into a card-collecting RPG format, offering advanced gameplay elements such as deck customization, strategic turn-based combat, and online multiplayer battles across mobile platforms.