There is no easy way to include all but exclude one or two game systems. The way folks have done it is to set up a query and then save the url, book mark it, whatever your browser of choice calls it. Here is an example that will bring up everything but D&D 5th edition: <a href="https://app.roll20.net/lfg/search/?days=&dayhours=&frequency=&timeofday=&timeofday_seconds=&language=English&avpref=Any&gametype=Any&newplayer=false&yesmaturecontent=true&nopaytoplay=true&playingstructured=13thage%2Cthreedandtalpha%2Csongoficeandfire%2Casofai%2Cadnd%2Caeg%2Cagesystem%2Calienyz%2Canima%2Canimecampaign%2Capocalypseworld%2Caquelarre%2Carcanecodex%2Carsmagica5%2Casandsh%2Cv6engine%2Caventures%2Cbarbariansoflemuria%2Cbasicfantasy%2Cbattletech%2Cbigeyessmallmouth%2Cbladesinthedark%2Cboard%2Cbreakfastcult%2Cbrigandyne%2Cburnbryte%2Cburningwheel%2Ccthulhu%2Ccard%2Ccastlesandcrusades%2Ccdbengine%2Cchroniclesoubliees%2Ccityofmist%2Cconan%2Ccoriolis%2Ccortex%2Ccortextplus%2Ccyberpunk%2Ccyerberpunkredjumpstart%2Cnumenera%2Cdnd_35%2Cdnd_4%2Cd6%2Cdasschwarzeauge%2Cdegenesis%2Cdeltagreen%2Cdoctorwho%2Cdogsinthevineyard%2Cdragonage%2Cdramasystem%2Cdune%2Cdcc%2Cdungeonslayers%2Cdungeonworld%2Cdutyandhonor%2Cearthdawn%2Ceclipsephase%2Celitedangerous%2Cendoftheworld%2Ceratheconsortium%2Cespergenesis%2Cexalted%2Cfate%2Cfallout%2Cfantasyage%2Cfantasycraft%2Cfeatsoflegends%2Cfengshui%2Cfiasco%2Cffrpg3rd%2Cfragmentos%2Cgumshoe%2Cgurps%2Cgammeworld%2Cgenesys%2Cgodbound%2Chero%2Chackmaster%2Chalomythic%2Charn%2Charrypotter%2Cherosystem6e%2Chitos%2Cicons%2Cicrpg%2Cironkingdoms%2Cironsworn%2Cjojobizarretabletop%2Ckidsonbikes%2Cpendragon%2Cknight%2Ckult%2Clancer%2Clabrynthlord%2Clotfp%2Clasersandfeelings%2Cledunjondenaheulbeuk%2Cl5r%2Cmazes%2Cmaid%2Cmarvelheroic%2Cmarvelsaga%2Cmetaladventure%2Cmortallybankrupt%2Cmothership%2Cmouseguard%2Cmutantyearzero%2Cmutantsandmasterminds%2Cmythras%2Cova%2Colddragon%2Coldschoolessentials%2Copenlegend%2Cdnd_1%2Cother%2Coverlight%2Cpalladium%2Cparanoia%2Cparanoiamongoose%2Cpathfinder%2Cpf2%2Cptu%2Crwbytabletop%2Cratsinthewall%2Creachoftitan%2Crolemaster%2Crunequest%2Cryuutama%2Csagasystem%2Csavageworlds%2Cscumandvillainy%2Csevendeadlysins%2Csotdl%2Cshadowrun%2Cshinobigami%2Csimplesystem%2Csplittermond%2Cstartrek%2Cstarwars%2Cstarfinder%2Cstargatesg1%2Cstarswithoutnumber%2Cstrain%2Cswordsandwizardry%2Csymbaroum%2Ctailsofequestria%2Ctalesfromtheloop%2Ctaverntales%2C9th_level_excellents%2Cthefade%2Conering%2Cquietyear%2Cthewitcher%2Ctormentarpg%2Ctormenta%2Ctraveller%2Callflesh%2Cvtm5e%2Cmagicalogica%2Cviejaescuela%2Cvilliansandvigilantes%2Cwardlings%2Cwarhammer%2Cwod%2Cfireemblemtt%2Cyatzoid%2Cyearzeroengine%2Cyogsquest%2Czweihandergap%2Cd20modern%2Cinsane&sortby=relevance&for_event=&roll20con=" rel="nofollow">https://app.roll20.net/lfg/search/?days=&dayhours=&frequency=&timeofday=&timeofday_seconds=&language=English&avpref=Any&gametype=Any&newplayer=false&yesmaturecontent=true&nopaytoplay=true&playingstructured=13thage%2Cthreedandtalpha%2Csongoficeandfire%2Casofai%2Cadnd%2Caeg%2Cagesystem%2Calienyz%2Canima%2Canimecampaign%2Capocalypseworld%2Caquelarre%2Carcanecodex%2Carsmagica5%2Casandsh%2Cv6engine%2Caventures%2Cbarbariansoflemuria%2Cbasicfantasy%2Cbattletech%2Cbigeyessmallmouth%2Cbladesinthedark%2Cboard%2Cbreakfastcult%2Cbrigandyne%2Cburnbryte%2Cburningwheel%2Ccthulhu%2Ccard%2Ccastlesandcrusades%2Ccdbengine%2Cchroniclesoubliees%2Ccityofmist%2Cconan%2Ccoriolis%2Ccortex%2Ccortextplus%2Ccyberpunk%2Ccyerberpunkredjumpstart%2Cnumenera%2Cdnd_35%2Cdnd_4%2Cd6%2Cdasschwarzeauge%2Cdegenesis%2Cdeltagreen%2Cdoctorwho%2Cdogsinthevineyard%2Cdragonage%2Cdramasystem%2Cdune%2Cdcc%2Cdungeonslayers%2Cdungeonworld%2Cdutyandhonor%2Cearthdawn%2Ceclipsephase%2Celitedangerous%2Cendoftheworld%2Ceratheconsortium%2Cespergenesis%2Cexalted%2Cfate%2Cfallout%2Cfantasyage%2Cfantasycraft%2Cfeatsoflegends%2Cfengshui%2Cfiasco%2Cffrpg3rd%2Cfragmentos%2Cgumshoe%2Cgurps%2Cgammeworld%2Cgenesys%2Cgodbound%2Chero%2Chackmaster%2Chalomythic%2Charn%2Charrypotter%2Cherosystem6e%2Chitos%2Cicons%2Cicrpg%2Cironkingdoms%2Cironsworn%2Cjojobizarretabletop%2Ckidsonbikes%2Cpendragon%2Cknight%2Ckult%2Clancer%2Clabrynthlord%2Clotfp%2Clasersandfeelings%2Cledunjondenaheulbeuk%2Cl5r%2Cmazes%2Cmaid%2Cmarvelheroic%2Cmarvelsaga%2Cmetaladventure%2Cmortallybankrupt%2Cmothership%2Cmouseguard%2Cmutantyearzero%2Cmutantsandmasterminds%2Cmythras%2Cova%2Colddragon%2Coldschoolessentials%2Copenlegend%2Cdnd_1%2Cother%2Coverlight%2Cpalladium%2Cparanoia%2Cparanoiamongoose%2Cpathfinder%2Cpf2%2Cptu%2Crwbytabletop%2Cratsinthewall%2Creachoftitan%2Crolemaster%2Crunequest%2Cryuutama%2Csagasystem%2Csavageworlds%2Cscumandvillainy%2Csevendeadlysins%2Csotdl%2Cshadowrun%2Cshinobigami%2Csimplesystem%2Csplittermond%2Cstartrek%2Cstarwars%2Cstarfinder%2Cstargatesg1%2Cstarswithoutnumber%2Cstrain%2Cswordsandwizardry%2Csymbaroum%2Ctailsofequestria%2Ctalesfromtheloop%2Ctaverntales%2C9th_level_excellents%2Cthefade%2Conering%2Cquietyear%2Cthewitcher%2Ctormentarpg%2Ctormenta%2Ctraveller%2Callflesh%2Cvtm5e%2Cmagicalogica%2Cviejaescuela%2Cvilliansandvigilantes%2Cwardlings%2Cwarhammer%2Cwod%2Cfireemblemtt%2Cyatzoid%2Cyearzeroengine%2Cyogsquest%2Czweihandergap%2Cd20modern%2Cinsane&sortby=relevance&for_event=&roll20con=</a> With that you can go and exclude/include anything you want. Please note this will not find newly added systems. (I updated it.)
