Like some other MMORPGs, "S.U.N." utilised the "hack and slash" way. Players were part of a rebel group known as "The Guidance". Items could be strengthened and upgraded throughout the game play of SUN. For large-scale combat such as siege warfare, "Soul of the Ultimate Nation" utilised a combat map with partitions that divided players into multiple fields each containing 20-40 characters; the outcome of each battle having direct effects on the combat occurring on other fields. SUN also allowed players to strategically set the stage for battles by choosing different types of maps, entry numbers, degrees of difficulty and types of monsters for a customized game play experience. SUN had three types of specified maps using a zone map system. Players started the game in a city and had to create zones to play the game. In terms of maps, the mission maps were the primary places where players can solve missions. The hunting maps were for tracking down monsters to level up characters, gather items and acquire in-game money. The quest maps were used to fulfill quests and to help users better understand the overall scenario of the game.