Secret of the Solstice, or SOS, is a fantasy MMORPG. The cute anime styled graphics resemble classic RPGs, and the game utilizes 2D sprites on 3D environments.

The game's story concerns the land of Xen, where a princess challenged her sister for the Solstice Sphere, an ancient powerful artifact and with it, the right to rule. As a result, there is a war and the land is divided. All characters start out as the same class, a citizen of Xen, and can begin on a path down of the game's four basic trees (warrior, mage, healer, and rogue archetypes) at level 16.

The game features many quests as well as story missions, a pet system, the ability to sell and trade, and even a recycling minigame where you can give old items for a chance to turn them into better ones.

There is also an emphasis on crafting enhancements for you and your pet. There are a couple of PvP modes and the GM team holds PvP and other in-game events. SoS is supported by a cash shop that sells many items from clothes to potions.