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| Top Mud Sites - MUD Listing | Quick MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| UrMud | urmud.com:80 | Custom | USA |  |
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| Urath | 198.144.66.104:4000 | Custom | USA | |
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| Uprising MUD | uprising-online.servegame.org:5150 | Not Listed Here | Iowa, United States | |
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| Unwritten Legends | unwrittenlegends.net:6666 | Custom | USA | |
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| Untamed Lands | untamedlands.betterbox.net:4321 | Smaug | USA | |
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| Unofficial Ultima MUD | forge.silverden.com:9240 | Smaug | USA | |
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| UnnamedMud | unnamedmud.org:2468 | CirceMUD | USA | |
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| Unknown Regions | halk.dhs.org:5555 | Star Wars Reality | USA | |
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| UNItopia | unitopia.de:23 | Lp MUD | Germany | |
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| United Dreams III | mud.united-dreams.com:2000 | Lp MUD | Netherlands | |
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| Unicorn Valley | unicornvalley.org:2500 / 204.209.44.124:2500 | Smaug | Canada | |
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| Unholy Lands | klein.htu.tuwien.ac.at:2010 | Lp MUD | Austria | - | |
| Underworld MUSH | underworld.teamlimit.net:9812 | PennMUSH | USA | |
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| Ulyenthia | ulyenthia.com:4000 | ROM | USA | |
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| Ultimate Realms | ultimate-realms.org:2222 | Lp MUD | Germany | |
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| Ugas Daos | www.ugasdaos.com:23 | Custom | USA | |
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| Twisted Prophecy | aegis.2mud.net:8500 | ROT | USA | |
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| Twisted Kingdoms | muck.twisted-kingdoms.com:8900 | MUCK | US | |
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| Twin Cities | twincities.wolfpaw.net:1888 | MUX | USA | |
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| Twilights Failings | coa.genesismuds.com:6543 | CircleMUD | USA | |
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| Twilight's Dawning | twilightsdawning.org:4321 | Smaug | USA | |
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| Twilight LPMUD | lpmud.twilight-mud.net:9999 | Lp MUD | Singapore | |
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| Twilight | twilight.pennmush.org:4201 | PennMUSH | USA | |
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| Turf | turf.org:4000 | Merc | United Kingdom | |
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| Tubmud | morgen.cs.tu-berlin.de:7680 | Lp MUD | Germany | |
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| Tsunami | tsunami.thebigwave.net:23 | Lp MUD | USA | |
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| Trinity | trinity.silverden.com:7350 | Smaug | USA | |
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| Trials of the War | totw.mudmagic.com:5321 | ROM | USA | |
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| TriadCity | triadcity.smartmonsters.com:9094 | Custom | USA | |
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| Treyvan MUSH | kharduin.net:4999 | MUSH | USA | |
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| TrekWars MUSH | bb6.betterbox.net:3335 | MUSH | Canada | |
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| Transformers: The Dark Eras | mud.themudhost.net:2005 | PennMUSH | USA | |
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| Transformers: Lost and Found | riverdark.net:1984 | PennMUSH | Seattle, WA | |
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| Transformers Generation One | tfgen1.pennmush.org:2003 | PennMUSH | USA | |
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| Tormented Soul | stormbringer.sysconn.com:9700 | Custom | USA | |
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| Tormented Empire | 66.137.193.101:8888 | Eye of the Storm | USA | - | |
| TorilMUD: The Sojourner's Home | torilmud.org:9999 | DikuMUD | USA | |
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| Tiranus | 65.163.194.239:2500 | ROT | USA | - | |
| Timezone | timezone.lpmud.com:4123 | Lp MUD | USA | |
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| Times of Trouble | mud.iflipout.com:3001 | AckMUD | USA | |
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| Time's Beyond | tyr.isunlimited.net:1602 | ROM | Canada | - | |
| Time of Troubles | meer.myftp.org:3334 | Unique | USA | |
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| Time of the Shadows | shadow.csc.edu:4000 | CirceMUD | USA | |
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| Time of Darkness | todmud.com:7700 | ROT | NY | |
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| Time Immemorial | www.deepfire.net:8463 | PennMUSH | USA | |
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| Tierra Media MUSH | mush.tierra-media.net:1446 | PennMUSH | Spain | - | |
| Tibia | - | Custom | Germany | |
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| THY QUEST | thyquest.com:4000 | Smaug | USA | |
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| ThunderDome II | tdome.net:5555 | CirceMUD | USA | |
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| Thunder Trails MUSH | thundertrails.org:4201 | TinyMUSH | USA | |
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