Old School RuneScape is a massively multiplayer online role-playing game (MMORPG) developed and published by Jagex. When Old School RuneScape launched, it began as an August 2007 version of the game RuneScape, which was highly popular prior to the launch of RuneScape 3. The game has since received engine improvements, new content, and quality of life updates largely decided by in-game polls. Despite having a smaller development team and a slower relative update schedule, Old School RuneScape has a larger player-base than RuneScape.

Old School RuneScape is an MMORPG with adventure elements. It features a persistent world in which players can interact with each other and the environment. The basic mechanics are largely the same as RuneScape. The player controls a single (human) character and can interact with NPCs, objects, and entities in the game world by left-clicking, or selecting an option from the object’s right-click menu, since many objects can offer more than one interaction option. Users can gain experience points (exp.) and level up individual skills, making their playable character more powerful or more capable of using that skill.

There is a large selection of skills, grouped mainly between three different categories: combat, gathering, and artisan. Combat skills aid the player in defeating enemy monsters or other players, with skills such as strength, range, and magic, among others. The gathering skills, such as mining, fishing, and woodcutting allow the player to gather in game resources. The artisan skills include skills such as cooking, crafting, and smithing. The input mechanics are mainly point-and-click. The game runs on a tick-based system where the game state refreshes every 600 milliseconds.