TDS Legacy is a classic 2D MMORPG developed in Argentina. It is an open-source game inspired by Ultima Online, featuring a medieval fantasy world where players can explore, fight monsters, complete quests, and engage in PvP combat. The game allows players to choose from different races (such as humans, elves, and dwarves) and professions (warrior, mage, thief, among others).

One of its most distinctive features is its hardcore PvP system, where players can attack and loot others freely, making survival a challenge. The game also includes guild wars, magic spells, and crafting mechanics. Over the years, various community-driven servers have emerged, each with unique modifications and custom content. Despite its simple graphics and retro gameplay, Argentum Online has maintained a dedicated player base for decades.