Complete LitRPGs:
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Threadbare series (including Small Medium and Dragon Hack) by Seiple (suggested order: trilogies TB1, SM, DH, TB2)
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Limitless Lands by Henegar
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Master Hunter K by From Hell
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World Tree Online by Hooper
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New Game Minus by Lin
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Light Online by Larcombe
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Eternal Online by Reynolds
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Retired S- Rank Adventurer by Wolfe & Falcon
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Life Reset by Kuznits
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Blessed Time and Viceroy's Pride by Plamann
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Towers of Heaven by Milan
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CivCEO by Karevik
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Forever Fantasy Online by Aaron and Bach
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This Trilogy is Broken (a.k.a. This Quest is Bullshit! from Royal Road) by Valentine (a.k.a. Nixia)
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War Aeternus by Dean
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PrimeVerse by Billiau
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Everybody Loves Large Chests by Iliev
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Somnia Online by Hanna
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The Dungeon Alaria by Kern
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Rise to Omniscience by Oster
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The Idle System by Pegaz
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Last Born of Ki'darth by McGowen
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Accidental Traveler (two complete trilogies) by Davis
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Savage Dominion by Chmilenko & Penman
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The Last Warrior of Unigaea and The Feedback Loop by Cooper
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Factory of the Gods (a.k.a. Keldora) by Raizman
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Nova Online by Knight
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Axe Druid by Johns
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Tower Climber and Arcane Kingdom Online by Tanner
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Emerilia by Chatfield
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Euphoria Online by Tucker
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Aether Gate Online by Hultberg
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Chronicles of Ethan (and standalone sequel Overpowered Howard) by Monk
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System Apocalypse™, Adventures on Brad, and Hidden Wishes by Wong
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Combat Codes by Darwin is great, but it's /r/ProgressionFantasy
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Death's Mantle by Cooper
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Space Seasons by Chapman
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Heroic Villain, and Bathrobe Knight by Dean
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Metagamer Chronicles by Hunter
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Fall of the Black Seraph by O'Kelley (a.k.a. The Genesis Game by Locke)
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Afterlife Online by Finn
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The Iron Teeth by Straughan
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Dungeons of Perdition by Basu
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Pangea Online by Rowland
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The Weaponized by Deckard
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Never Die Twice and Kairos by Durand (a.k.a. Void Herald on RR)
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Headshot Online by Siege
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Trinity of the Kairos by Sinclair
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Chronicles of Wycon by Moore
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Abduction Cycles by Cressman
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They Called Me MAD and The Houndsman by Pal
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The Bright Lord by Knowles
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Nora Hazard by Corvin
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Beast Realms by Jones
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Arena Manager by Opo
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Frostworld by Peel
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Magnus by Prime
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Metamorphosis Online by Grey
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Alterlife by Moss
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Underverse by Cajiao
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The Orzare Chronicles by O Toole
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Alpha Physics by Kozlowski
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Legends of Ascension by Hultberg
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Badges of Dorkdom by Hodges
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Star Divers by Landry
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Legendary Farmer by Elizabeth Oswald
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Class Shift by Sean Oswald
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Ten Realms by Chatfield
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The Weight of it All by Thorn
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Phase Shift by Johnson
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Voidbringer Campaign by Hall
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Sky Realms by Osgood
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Cultivator vs. System by Valerios
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Uniworld Online and Glendara Awakens by Brooks
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Freedom Online by Lingard
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Enora Online by Adams
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Harbinger by Keene
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Bad Luck Charlie (a.k.a. Dragon Mage) by Baron
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Apocosmos by Gkirgkiris
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Real- Time Starcommander by Gregory
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Dungeon Realms by Yang
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Death's Favorite Warlock by Dean
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The Game of Gods by Kern
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Tower Apocalypse by Cassius & Tang
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Real- Time Starcommander by Gregory
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Hack, Slash & Burn by Herzman
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Cowboy Necromancer (some novellas to follow) & Tokens & Towers by Cooper
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Apocalypse Gates (and I think other series) by Schinhofen