Materia Magica is the best game that I have come across to date. It has a large player base with usually 100-300 players online at any one time. MM is newbie friendly with an extremely helpful immortal staff and guides who spend most of their time helping new players. It has dozens of areas with over seven million rooms total to explore. There are multiple towns that are over one thousands rooms each where players can get quests, level together or chat. For those that enjoy player killing there are pk clans you can join that allow you to fight people in other pk clans or you can fight in certain rooms that are set for PK. If your looking to start playing MUDs or your a long time players of MUDs stop by MM, it will change the way you look at other online games.