Crossovers
- Hosers - Fooker and Nick are visited by Lev and Aric, looking for Stein... and lots of gluttony! Starting 14-02-2000
- Help Desk - Fookers changes an Ubersoft software program so its bugfree... and the war is on! Starting 29-01-2001
- Absurd Notions - Fooker and Darren are put under intervention for their Linux-situation! Starting 11-06-2001
- Funny Farm - Trudy teams up with the Concordat and PC on a deal... evil minds unite! Starting 27-07-2003
- Kevin & Kell - Ki and Nick use the MUTEX and ends up in the world of Kevin and Kell! Starting 25-01-2004

Cameos/References
- Hosers - It looks like the whole Hoser-gang is ready to enter the geek-paradise of Nerdvana! 13-09-1999
- Melonpool - Off course you will expect to find Mayberry Melonpool at Nerdvana! 13-09-1999
- College Roomies From Hell!!! - Roger seems to be more than excited before entering Nerdvana! 13-09-1999
- Sluggy Freelance - The geekiest place on Earth has attracted Riff and Torg off course! 13-09-1999
- User Friendly - Nerdvana also pulls Miranda, Mike and Greg into its geeky entertainment! 13-09-1999
- Sluggy Freelance - If they can do it in Sluggy, they might be able to do it here too! 22-03-2000
- Newshounds - One little kid is dressed up in the furry costume of Kevin! 31-10-2000
- Sluggy Freelance - Another little kid is dressed up as Riff for the Halloween Party! 31-10-2000
- Bruno the Bandit - A very openmouthed kid wears the costume of Bruno the Bandit! 01-11-2000
- Kevin & Kell - Kevin Dewclaw has received the honor of being a kid's Halloween costume! 01-11-2000
- Suburban Jungle - There's possibly a nice kid under somewhere under the fur of the Tiffany costume! 01-11-2000
- Superosity - A kid dressed out as Chris for Halloween? Now THATS scary! 02-11-2000
- Nukees - Under the Halloween costume of Gav there's a candy-happy kid! 02-11-2000
- Elf Life - Finally one kid has chosen to dress as an Elf... but not any Elf! 02-11-2000
- Melonpool - Ralph is attending the spectacular party... trading stories with Trudy! 22-05-2001
- Nukees - Gav is attending the C.R.U.D.E competition in a prolonged cameo! Starting 22-05-2001
- It's Walky! - Head Alien is thrown out early in the competition... for being Alien!? 28-05-2001
- Melonpool - Ralph is out for similar reasons, No Aliens Allowed! 28-05-2001
- Help Desk - Tall dark hooded stranger in 2nd panel... need help from him? 28-05-2001
- Elf Life - Is a Dragon in tuxedo a Supernatural being? He does not think so... 28-05-2001
- Funny Farm - PC is not a sentient machine... he is a Megalomaniac sentient machine! 28-05-2001
- Superosity - Wonder how a boy with a cape could end up at a competition like this? 28-05-2001
- Sluggy Freelance - Dr. Irving Schlock is also a guest at the evil party! 22-05-2001
- User Friendly - Pitr gets eliminated from the (rigged?) competition! Out he goes! 04-06-2001
- Sluggy Freelance - In the contest for membership of C.R.U.D.E, Bun-Bun jumps out! 04-06-2001
- Help Desk - Seems like Ki is not yet ready to fit the requirements for working at Help Desk! 07-05-2002
- User Friendly - Ki is normally user friendly, but when it comes to an interview with Stef, its hopeless! 08-05-2002
- Sluggy Freelance - Ki seeks a job in Aylee's coorporation... 09-05-2002
- Newshounds - The humanized KPET crew cover the war of Manhattan! 28-07-2002
- Newshounds - The Newshound crew finally comes through to report crucial news from Manhattan! 19-09-2002
- Sluggy Freelance - An extended cameo featuring most of the main Sluggy cast! 09-02-2003
- Nukees - So, They are also into the Agnostica program? Interesting! 13-02-2003
- Help Desk - Obviously Trudy has blackmail material on Ubersoft, else they were not on the list! 01-08-2003
- Kevin & Kell - Looks like Trudy has blackmail material on Herdthinners, across the dimensions! 01-08-2003
- El Goonish Shive - Fooker and Fred visits the laboratories, and pass Dr. Germahn and Amanda! 20-03-2005
- Sluggy Freelance - Nick ends up in Sluggy Freelance through the MUTEX, facing his mirror self! 16-11-2005
- Zortic - Zoie eyes Nick and his story skeptically when he suddenly shows up in Zortic... as Zortic! 16-11-2005
- El Goonish Shive - Fred guides Nick as he enters EGS... with a Grace sleeping in his lap! 16-11-2005
- Nukees - Through the MUTEX, Nick becomes Gav... though only for a short panel! 16-11-2005
- Help Desk - The MUTEX takes Nick into a new comic and body, making him work Help Desk! 16-11-2005
- Absurd Notions - Nick takes on a new comic as a new character... and it's Absurd Notions! 16-11-2005
- Wapsi Square - Arriving in a new comic and body, Nick suddenly takes on weight... on top! 16-11-2005
- Melonpool - Nick's arrival in Melonpool is noticed... though its taken pretty much in stride! 16-11-2005
- Zebra Girl - Looks like Nick's arrival in Zebra Girl through the Mutex gave... magical results! 16-11-2005
- Boxjam's Doodle - Yep, that outfit may be too blue for Mischief... and too covering for us! 06-04-2007
- User Friendly - One small Dust Bunny figurine falls victim to the random rubberband firings! 28-05-2010
- Bruno the Bandit - Bruno is ruled out as Mischief's date because... well, see for yourself! Mischief's Night Out Page 6
- Elf Life - I wouldn't exactly call Baughb "floppy", but its obviously not the first time...! Mischief's Night Out Page 6
- Greystone Inn - Yep, better rule out Argus Mischielf, he is craggy and you cannot afford him! Mischief's Night Out Page 6

GPF cameos/references can be found in:
- Newshounds - Being one of Kevin's hallucinations is obviously ok with Nick! 14-06-1999
- College Roomies From Hell!!! - Fooker comes by to have an appreciating look at Mike's tentacle 07-12-1999
- Funny Farm - Nick gives the magic word that can cause pain to any sentient computer! 23-02-2000
- Funny Farm - Nick is keeping the records for the CRFH-survivors support club! 09-07-2000
- Joe Average - For Fooker, Joe is just a copycat, even after a year in the community! 30-08-2000
- Alice! - The girls manage to hide, and Dwayne and Nicole don't even see them! 13-10-2000
- Melonpool - Ki likes cats, and Nick.... tries to land on all four! 09-12-2000
- Freefall - Nick is perhaps not a cartoon star, but... well, perhaps he is after all!? 19-01-2001
- It's Walky! - With the artist filler-dead, Nick is among those who rules! 17-07-2001
- Melonpool - Fred the Sentient Slime crawls by! 11-02-2002
- Melonpool - Fred does another cameo as a hideous creature! 02-09-2002
- If Then Else - Yeah, the place sure is packed, and one of the people packing is Yoshi! 25-09-2002
- If Then Else - Double Trouble? Yes, you might say thats Yoshi and Scott to the booth! 17-03-2003
- Greystone Inn - Nick walks the red carpet, representing the crew of GPF! 09-05-2003
- Labgoats - P is for Persephone, of disinfectant infernal! 23-10-2003
- College Roomies From Hell!!! - In the last panel we see Trudy in her evil smiling self at the party! 17-05-2004
- Super Chibi Death Bots - Frogbot appears as a smiling Fred the Slime for Halloween! 01-11-2004
- Melonpool - It has been noted that GPF scores much popularity from their nerds of both sexes! 28-06-2005
- Narbonic - Sexually assaulted by your College Fiancee? Ki has already taken care of that! 25-01-2006
- Zortic - Splink has found a Websnark article about GPF... involving various codes...? 07-04-2006
- Tru-Life Adventures - When an intelligent slime tells you to clean the fridge... you do what it says! 11-04-2006
- If Then Else - For the Gamester and Mischief, rating a potential threat is just sixth sense! 03-11-2006
- Scandal Sheet - The intelligent slime mold plushie has won a place in the office environment! 20-12-2006
- Punch an' Pie - Looks like there's a Fred-plushie among all of Angela's "crap"! 02-03-2007
- If Then Else - An Intelligent Slime is rare, but the same is not true about the Common Geek! 24-04-2007
- The KAMics - Fred the Slime is sticking his head up from the sink in Gertrude's laboratory! 09-08-2007
- CameoComic - By using the MUTEX, the GPF-crew has previously visited other worlds! 23-08-2007
- The Crossoverlord - At least for a time Ringo hung out with a like-minded friend, the Gamester! 18-11-2008
- Spoofy Randomness - Professor Wisebottom is well versed in technology... but in the family tree of sentient computers? 07-06-2011
- Spoofy Randomness - Nick represents GPF for SP's 10 year celebrational strip for its webcomic inspirations! 01-09-2019
- Boritom - Obviously they don't have sentient slime molds at Boritom's planet #00007
- Bigger Than Cheeses - People from GPF must be around in the crowd, they are spotted by Thanatos! Strip 121

Webcomic artist appearances/references:
- Sluggy Freelance - Pete Abrams is sitting next to Ki on the plane, making a few sketches to pass time! 07-04-2002
- Nukees - The bluehaired haughty sysadmin is none other than Keenspots own Darren Bleuel! 06-03-2004
- Nukees - Darren ("Fleuel") Bleuel and friends are picking snowballfight with Sharon & Fooker! 02-12-2004

Jeff Darlington cameos/references:
- Funny Farm - Figures that Jeff would have a daytime job as a computer technician! 30-07-2002
- Sluggy Freelance - Jeff Darlington performed well in the role at Kitten 3 in this storyline! 15-12-2002

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