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| Top Mud Sites - MUD Listing | Quick MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| Nightshade - The Bane of Boredom | Nightshade.vester.dk:8000 | ROM | Denmark | - | |
| Nilarden | mythicpk.homedns.org:9010 | Custom | USA | - | |
| NirvanaMUD | mud.nlink.com.br:3000 | CirceMUD | Brazil | - | |
| No Man's Land | 63.162.239.68:5001 | Lp MUD | Norway |  |
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| NobleMUSH | csmctmto.netside.net:4664 | TinyMUSH | USA | - | |
| Nocturnal Mysts | mysts.legendarybeginnings.net:2004 | Unique | Canada | |
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| Northern Lights Mud | tamarisk.ab.ca:2222 | DikuMUD | Canada | |
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| Nuclear War MUD | mud.astrakan.hig.se:4080 | Lp MUD | Sweden | |
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| Nuevia | telnet nueviamud.no-ip.org:5555 | CoffeeMUD | Michigan | |
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| Obirod 2 | slayn.net:6666 | Lp MUD | USA | |
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| Oblivion: Destiny's End | oblivionmud.org:3003 | DikuMUD | USA | |
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| Obsolevi Regnatus | afmud.hopto.org:4000 | ROM | USA | - | |
| OceanCrest | falconcrest.yi.org:4040 | Mordor | USA | |
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| One Percent | 1mud.org:9000 | ROM | USA | - | |
| Online Gaming Resource | ogrmush.com:6700 | TinyMUSH | USA | |
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| Onslaught:EoC | bb1.betterbox.net:5500 | CircleMUD | USA | |
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| OracleBBS | oraclebbs.com:23 | Unique | USA | - | |
| Organelle | organelle.org:4045 | Custom | USA | |
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| OtherSpace: Millennium | jointhesaga.com:3005 | PennMUSH | USA | |
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| Otherworld | otherworldmud.com:4000 | CircleMUD | USA | |
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| Ouroboros MUD | ouroboros.mudplace.org:8000 | ROM | USA | |
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| OurPlace Mud | ourplace.org:6543 | Envy | USA | |
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| Out of Darkness | 12.171.188.40:4040 | Godwars | USA | |
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| Out of Time | - | MUX | Sweden | - | |
| Outer Realms | cyrus.mudhaven.com:4321 | Unique | USA | - | |
| Outlands | theoutlands.net:4444 | ROM | Not Listed Here | |
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| Outlands - 4th Age | void.dune.net:3000 | ROM | USA | |
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| OutlandsMud | outlandsmud.com:4000 | DikuMUD | USA | |
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| Outpost Station | the-edge.dynip.com:6666 | PennMUSH | USA | - | |
| Outreach | 209.123.65.13:6969 | TinyMUSH | USA | |
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| Outremer | outremermux.org:4321 | MUX | USA | |
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| Overdrive | overdrive.concentric.net:5195 | Lp MUD | USA | |
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| Overkill | 217.10.143.11:4321 | Godwars | United Kingdom | - | |
| Overkill | mudcraft.net:9999 | Godwars | United Kingdom | - | |
| Overlord | overlord.dungeon.ws:2000 | Lp MUD | United Kingdom | |
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| Palavi Mud | blinksoft.com:6969 | Unique | Canada | - | |
| Pale Shadows | notopic.net:9000 | Godwars | USA | - | |
| Pangaea | pangaeamoo.org:7777 | MOO | USA | |
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| PaNiC Mud | 130.161.36.86:4000 | Envy | Netherlands | |
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| Paradise Revisited | sop.wolfpaw.net:6996 | AckMUD | USA | - | |
| Paradox - ROT | 195.84.229.42:5000 | ROT | Canada | - | |
| Paradox MUD | mud.pacific.net.au:9000 | Merc | Australia | |
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| Path From Desolation | yccafe.org:4000 | CircleMUD | USA | - | |
| Pavor Nocturnus | zombie.wolfpaw.net:1881 | MOO | USA | |
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| Pawn of Prophecy | mud.prophecy.lu:4000 | ROM | Not Listed Here | |
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| Pawns of Prophecy | riva.erisian.net:2345 | MUX | USA | |
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| Pendulus | mud.pendulus.org:1536 | ROM | USA | |
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| Peninsulae SPQR | - | Unique | Germany | - | |
| Peril of Oreth | fantasy.xidus.net:1717 | ROM | USA | - | |
| Perilous Realms | perilousrealms.com:23 | Unique | USA | |
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