Tibia has its own Wiki: http://tibia.wikia.com/wiki/Main_Page

Tibia is a massively multiplayer online role-playing game (MMORPG) created by CipSoft. It is one of the oldest MMORPGs and was considered most noteworthy in its early years; however, with the development of MMORPGs, its popularity has grown much slower than other MMORPGs. Its most unusual aspect is its 2D graphics environment, which may have contributed to its slow growth, as the gaming community rapidly shifted to 3D graphics. It was first released in January 1997.
It is a free game which is open to the public, though players have the option to pay a fee in order to upgrade to a premium account, granting special in-game benefits, including additional areas to explore, access to vocation promotions, and extra spells.

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