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| Top Mud Sites - MUD Listing | Quick MUD Search |
| MUD Name | MUD Address | Codebase | Location | Homepage | Current Rank |
| Rebel Star | rebstar.wolfpaw.net:8888 | Star Wars Reality | USA | - | |
| ReBoot: Version 2.5 MUSH | 3sygma.com:2033 | PennMUSH | USA |  |
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| Red Dragon | reddragon.org:3000 | Lp MUD | USA | |
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| Redemption | mud.redemptionmud.com:4000 | ROM | Canada | |
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| Reflections of the Pattern | reflections.orisis.net:1234 | ROM | USA | |
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| Reflections of the Wheel | wotmud.wehostmuds.com:8086 | CircleMUD | USA | |
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| Rehobaom's Legacy | hypercube.org:9000 | ROM | USA | |
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| Reinos de Leyenda | rlmud.org:23 | Lp MUD | Spain | |
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| Rek-Mud 4: The Four Kingdoms | rekmud.net:6000 | Godwars | USA | |
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| Rek-Mud 4: The Four Kingdoms | rekmud.com [67.18.236.138]:5000 | Godwars | USA | |
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| Rekmud 4: The Four Kingdoms | daw.strangled.net:8000 | Godwars | USA | - | |
| Renegade Earth | renearth.ath.cx:1999 | DikuMUD | USA | |
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| Renegade Outpost 5 | renegadeoutpost.com:9999 | Silly | USA | |
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| Renegades of the NationState Worlds | harbinger.genesismuds.com:1030 | Star Wars Reality | U.S.A | - | |
| Renshai MUD | bb13.betterbox.net:4200 | DikuMUD | USA | - | |
| Resident Evil: Outbreak | tyro.genesismuds.com:5300 | Star Wars Reality | USA | |
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| Resurrection of Truth | xylam.divineright.org:4060 | Dragonball | USA | - | |
| Return of the Gods | ralisten.cjb.net:4201 | MUSH | USA | |
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| Return of the Paradox 2 | freemud.mine.nu:5000 | ROT | Not Listed Here | - | |
| Return of the Shadow | rots.us:3791 | Custom | USA | |
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| Return of the Shadow | rotsmud.dyndns.org:3791 | Custom | North Dakota, USA | |
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| Revelation | N/A:0 | Custom | USA | |
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| Revelations | - | Custom | USA | |
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| Revenge of the Jedi | 209.83.132.70:9400 | CirceMUD | USA | |
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| Rhostshyl | ghost.mybis.com:4201 | RhostMUSH | Not Listed Here | |
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| Riftshadow | 63.146.55.11:9999 | ROM | USA | |
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| RiftsMUD Online Gaming | riftsmud.org:1122 | Lp MUD | USA | |
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| Ring of Power | rop.duckdns.org:7777 | Custom | UK | |
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| Rise of Myrmidon | - | CirceMUD | USA | |
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| Rise of the Dark Moon | jitterbug.mudmagic.com:2500 | Star Wars Reality | Canada | - | |
| Rise of the Dragonarmies | rod.genesismuds.com:8600 | ROM | USA | |
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| Rise of Tiran | riseartane.kyndig.com:6767 | ROT | USA | |
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| Rising Force | rf.kyndig.com:6000 | Smaug | USA | |
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| Rising Phoenix | phoenixrising.genesismuds.com:3501 | DikuMUD | USA | |
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| Rites of Passage | rop.ropmud.com:3737 | EmlenMUD | USA | |
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| RivaMUSH | riva.silvren.com:7777 | RhostMUSH | USA | |
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| Rivers of MUD | rom.org:9000 | ROM | USA | |
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| Rock: Crashed Plane | dillfrog.com:4000 | Custom | USA | |
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| RockTwo: Revisited | rockserv.game-host.org:4000 | Custom | USA | |
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| Rocky MUD | rockymud.dyndns.org:4000 | Silly | Canada | |
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| Rogue | fics2.freechess.org:2222 | Lp MUD | USA | - | |
| Rogue Trader | roguetrader.dyndns.org:23 | Unique | USA | |
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| Rogue Winds | roguewinds.com:5000 | Smaug | USA | |
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| Ronin | game.roninmud.org:5000 | DikuMUD | Not Listed Here | |
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| ROTH | mud.horsemen.net:4000 | ROM | USA | |
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| Round Table | rt.caveman.org:2222 | Lp MUD | USA | - | |
| RubbeRoom | rubberoom.yi.org:6969 | Lp MUD | USA | - | |
| RuinedNationMUSH | malaclypse.chaosrunner.org:2200 | MUSH | USA | - | |
| Ruins of Crestil | ruinsofcrestil.com:8000 | Not Listed Here | US | |
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| Ruins of Korinthia | 24.176.156.146:4444 | EmlenMUD | USA | - |
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