| Title | Author | KB | Genre |
|---|---|---|---|
| Jabe's Nightmare | WiL | 6.0 | Incomplete, Puzzle |
| Jack Adventures Presents: Be Careful Where You Step! | jack2496 | 1.73 | Action |
| Jack Knack | Danny Goodman | 3.16 | Action |
| Jack Knack X | _ry0suke_, Danny Goodman | 20.61 | Action, Remake |
| Jack O' Lantern | Newt | 20.35 | Adventure |
| Jack: Home | end13 | 10.12 | Adventure |
| Jack: Incane Street | end13 | 21.76 | Action, Adventure |
| Jack: Space Trip | end13 | 9.15 | Shooter |
| Jack: Space Trip 2 | end13 | 8.65 | Shooter |
| Jacky T | Viovis Acropolis | 27.55 | Other |
| Jaguar: Quest for Water | Cyrus | 23.55 | Adventure |
| Jail | Jason Britain | 1.94 | Adventure |
| Jake's Journey | fudgemonkeysuncle | 17.19 | Action, Adventure |
| James Bond Club | Thanos81 | 7.74 | Incomplete |
| JAMES BOND VS BLOFELD ZZT DEMO | BigtimeDude | 2.15 | Action, Adventure, Advertisement |
| James Jon 007 | InKane | 6.24 | Comedy |
| Jami's Undercity | Anthony Testa, JamiJo | 28.67 | Adventure |
| Jami's Undercity Remix | Anthony Testa, BlueMagus, JamiJo | 29.75 | Adventure |
| Jason's Adventure | The Weazle | 5.69 | Adventure, Fangame |
| JAVO | Leamas | 38.01 | Adventure |
| Jay's 'Hood I and ][ | Jay Meagher | 45.86 | Adventure, Compilation |
| Jay's 3D Maze | Jay Anderson | 2.83 | Engine, Other |
| Jazzy Likes Dresses | Viovis | 23.09 | Cinema, Comedy |
| Jedi Fight (Demo, v1.1) | noachnet | 13.62 | Adventure, Demo, Fangame |
| Jedi Knight | noachnet | 44.65 | Adventure |
| Jeebie's Quest | Darren Hewer | 28.83 | Adventure |
| Jennifer Janowski is Doomed | Anna Anne Anthropy | 109.31 | Horror, Mystery, Story |
| Jeremiad | _catbutt_, PUNISH_PORNSTAR, suresh | 36.43 | Adventure, Cinema, Experimental, Trippy |
| Jeremyville | Unknown | 9.15 | Action |
| Jesse | JJL99 | 8.28 | Adventure |
| Jesus 2035 | zamros | 10.5 | Comedy |
| Jet Adventure 1 | Morphman | 10.53 | Action, Shooter |
| Jet Adventure 1+2 | Morphman | 17.5 | Action, Shooter |
| Jex | LordChimpee | 30.91 | Action, Shooter |
| Jilk Maker '22 | Agent Orange | 2.27 | Advertisement, Cinema, Other, Trippy |
| Jimbo The Trippy | Dsone | 38.53 | Action |
| Jinx And The Journey | Graham Peet | 71.07 | Action, Adventure |
| Joe 3: Joe is Back | Bobo245 | 24.15 | Adventure |
| Joe Blow Socipoon | froznfire | 34.28 | Action |
| Joe Blow Socipoon (June 26th, 1996) | froznfire | 33.57 | Action |
| Joe City | Unknown | 7.25 | Action, Adventure |
| Joe Goes To School | Bobo245 | 5.61 | Adventure |
| Joe's Apartment | Daniel Tiernan | 5.66 | Adventure, Fangame |
| Joel | Unknown | 14.48 | Adventure, Incomplete |
| Joel's World 1-6 | Joel M. Smith | 89.78 | Adventure |
| Joel's World 7 & 8 | Joel M. Smith | 47.04 | Adventure |
| Joey, and The Revenge of the A.O.L. Monsters | J Dragster, Jason Marasco, Joey Drago | 9.8 | Adventure |
| John's World | Dogbreath | 10.85 | Action |
| Johnathan | Scribbit | 13.96 | Comedy |
| Johnny Smileyfingers | Knightt | 41.36 | Action |
| Jordan's Quest | Warlock93 | 7.76 | Adventure |
| Jordan's Quest, Matt's Dream | Stan Syckes | 8.02 | Adventure |
| Jordan's Quest: Version 2 | Warlock93 | 7.91 | Adventure |
| Josh's World | Lmjmajl | 1.77 | Other |
| Joshua Town! | Andrew Hartung | 5.57 | Adventure |
| Joshuwin's Super ZZT | Joshuwin | 5.12 | Action |
| The Journey of Béner and Boo | Thanos81 | 16.42 | Adventure, Incomplete |
| Journey of Something | I Give Up | 10.63 | Adventure |
| Journey of something 2 | I Give Up | 16.86 | Adventure |
| Journey Part 1 | Scott Miller | 8.97 | Shooter |
| Journey to Hell 1: The Arrival | ZZDevelin | 38.52 | Action |
| Journey to the Centre of Nowhere | Chili, Zhacolian | 35.23 | Adventure |
| Journey to the Centre of Nowhere (08/14/1998) | Chili, Zhacolian | 34.79 | Adventure |
| Journey's End | Doc | 11.74 | Adventure |
| Journey: City of Wizards | Doc | 26.83 | Adventure |
| Journeys | alank8456 | 9.83 | Adventure |
| JP Tour Full Version | jkpj | 11.35 | Help, Registered |
| July 4th 2003: happpy id4 fda,mnit | Viovis Acropolis | 20.41 | Trippy |
| Jungle | Greg Miller | 2.24 | Adventure |
| The Jungle Evil | Mark McIntyre | 20.56 | Adventure |
| Junk | Ethan Hunt | 223.3 | Compilation |
| Junkyard | Poppa Good | 14.42 | Adventure |
| Jurassic Park | Red | 19.6 | Adventure, Fangame |
| Jurassic Park Demo | HM | 11.76 | Demo |
| Justice League International | Steven Lyons | 15.33 | Action, Fangame |
| Justice? | Miakar | 29.34 | Experimental |