General NSFW Japanese Flash, Java & Unity Sites

Mostly Japanese Flash:
http://isotonix.jp/ (this is the maker of the Flash-based Breakout/Arkanoid clone engine you'll see a lot of)
http://nix.kir.jp/adult/ (should be similar to above)
http://nekoboku.sakura.ne.jp/
http://kyokun.kir.jp/game/index.html
http://mokusa-painting.net/
http://www.koooonsoft.jp/
http://necofla.x.fc2.com/index.html
https://infinity-weblink.net/
http://eroflash.jp/
http://exaboy.jp/top.html <(new) (old)-> http://web.archive.org/web/*/http://www88.sakura.ne.jp/~eros*
http://t-graph.dojin.com/
http://www.wa.commufa.jp/~ichini/index2.html
http://pochi.x.fc2.com/menu.html
http://xioukoku.x.fc2.com/
http://pastelwing.net/
http://www.sherbetsoft.com/
http://ngmyu.com/ (old)-> http://web.archive.org/web/*/http://www116.sakura.ne.jp/~ngmyu/index.htm
http://akadamaya.jp/
http://chavinet.html.xdomain.jp/ (old)-> http://web.archive.org/web/*/http://homepage2.nifty.com/chavinet/ (excluded from Wayback)
http://e-f-frontier.net/
http://ebox.h.fc2.com/
http://assfla.h.fc2.com/top.html
http://urc.sakura.ne.jp/hp/ - not sure how site is set up (Wayback shows others): http://urc.sakura.ne.jp/hp/playroom/slot_m/
http://www.sakuraprin.com/ - not sure how site is set up (there's others): http://www.sakuraprin.com/img/flash/08/index.html
http://beraboman.fc2web.com/ - not sure how site is set up: http://beraboman.fc2web.com/OB0001650.swf
http://blue.ribbon.to/~ifx/komomo.net/index.html
http://yumina222.sakura.ne.jp/
http://jyujiro.sakura.ne.jp/top.html
http://wmarron.sakura.ne.jp/index.html
http://www.yakinegi.net/ (old)-> http://www.netlaputa.ne.jp/~ryo_w/
http://stharry.h.fc2.com/
http://web.archive.org/web/*/http://www115.sakura.ne.jp:80/~n-s/*
http://kuroribon.sakura.ne.jp/
http://www.katakuri.sakura.ne.jp/~jyb/
http://noba.sakura.ne.jp/
http://lovny.jp/
https://www.ppwks.net/
http://www004.upp.so-net.ne.jp/hotcake/index.htm
http://web.archive.org/web/20170625084614/http://www.blackclassroom.com:80/flash/flash.html (site's still up; has no Flash section)
http://ohimesamaclub.com/
http://yaminabetei.sakura.ne.jp/mainpage.htm
http://okina-naoki.net/
http://nuclear.pandora.nu/X/top.htm
http://callsound.nusutto.jp/ - I think they're they're SFW except for the bottom one)
http://presidentaya.web.fc2.com/rb/AQB/AQB.html
http://crazywwwww.web.fc2.com/index-2.html
http://pubis.x.fc2.com/main/main.html
http://tryline.x.fc2.com/top.html
http://sandals.web.fc2.com/
http://www.pakira.jp/adult/game.htm
http://free-eroge.jp/
http://ripmomo.com/rip/index.html
http://www.hakuden.com/
http://shirayuki.saiin.net/~edens-ride/contents/game.html
http://nanigasi-maken.seesaa.net/
http://honya.uunyan.com/
http://yumina222.sakura.ne.jp/frame.html
http://www114.sakura.ne.jp/~sobaudon/index.html
http://yamcat.sakura.ne.jp/
http://ichi-kinoshita.sakura.ne.jp/
http://acht.sakura.ne.jp/main.html
http://yoridorigreen.sakura.ne.jp/topic.html
http://yamadagudon.h.fc2.com/top.html
http://kuro3.x.fc2.com/index2.html
http://bisyoujynooippai.x.fc2.com/
http://www.usamimi.info/~wakabakaoru/wp201403/
http://www.kaziba.net/
http://soul.saiin.net/
http://rai.x0.com/
http://music.geocities.jp/night_walker_sue/
http://www2.plala.or.jp/gouwan/index.html
http://yotsuba.saiin.net/~elie/
http://souna.moo.jp/index.html
http://justicers.sakura.ne.jp/main/index.html
http://shinelip.m78.com/pc.html main page seems to just link to the mobile site: http://shinelip.m78.com/
http://trinity.x0.com/mw.html
http://sota.kumogakure.com/
http://www.moelog.com/
http://sugarcapsule.com/
http://tinklebell.jp/
http://hai1001.x.fc2.com/index.html
http://www.comic-empire.sakura.ne.jp/
http://www.ne.jp/asahi/bitter-blend/eternity/index.html
http://yatsurugi.sakura.ne.jp/main.html
http://hiroyoshi.hannnari.com/html/gimmick.html
http://bokuhako.web.fc2.com/block/s/kuzusi.html
http://umt.s21.xrea.com/web_game.htm
http://azukichiz.web.fc2.com/i/sample.html
http://pmpk.dojin.com/contents.html
http://onikabe.arings.com/index2.html
http://www.yjinn.com/
http://castlage.com/
http://kuma-panda.sakura.ne.jp/
http://tsunezo.sakura.ne.jp/main.htm
http://ponpondou.x.fc2.com/frame.html
http://na-s.sakura.ne.jp/pit/index.htm
http://sufial.sakura.ne.jp/tenhuu/
http://totora.jpn.org/
https://heiwachan.com/flash/ - currently open directory, main site doesn't seem to work
http://abk00.blog71.fc2.com/ - 500+ breakout clones
http://www.askray.jp/nicky.cgi
http://kson.jp/game.htm
http://cielmer.x.fc2.com/main.html
http://factorydd.blog23.fc2.com/
http://www1.ttcn.ne.jp/~kumatyufarm/
http://www.usamimi.info/~daioh/main.html
http://fastr.blog70.fc2.com/blog-category-10.html
http://nidhog.jp/top.html
http://sa.rojo.jp/top.shtml
http://nikukyu.h.fc2.com/
http://logiere.sakura.ne.jp/
http://aoihana.x.fc2.com/
http://himegocyo.h.fc2.com/a_top.html
http://kurousagi.h.fc2.com/ura_top.html
http://karinka.sakura.ne.jp/karinka/magikarinka.htm
http://pudding.muvc.net/flame.html
http://mamemochi.com/mochi/top.htm
http://www.stick7.com/flash01.htm
http://kumao.xn--b9j9cu85n.com/index.html = http://kumao.孕ませ.com/index.html
http://www16t.sakura.ne.jp/~momodenpa/index2.htm
http://nanase5110.web.fc2.com/
http://takoyakigirls.x.fc2.com/
http://fero.muvc.net/top.html
http://x.fanatail.com/ - http://fanatail.com/ is technically SFW
http://15061481.web.fc2.com/index2.html
http://norueisuisan.x.fc2.com/noruei/images/html/main.html
http://ramankotarou.blog.fc2.com/
http://yoruda.sakura.ne.jp/top_.html
http://porkhouse.blog.fc2.com/
http://tutihige.x.fc2.com/
http://succubus-eyes.xii.jp/
http://www.lunatictree.mydns.jp/~bwt/
http://kamebeya.o0o0.jp/
http://yamadaweb.sakura.ne.jp/game.html
http://www.over-drive.jp/
http://nudamozu.web.fc2.com/a.html
http://ryoryogames.untokosho.com/
http://sei.sakuraweb.com/
http://tabuchisannokakurega.x.fc2.com/
http://zekamashi2015.blog.fc2.com/
http://orihikarando.web.fc2.com/
http://morisato.x.fc2.com/rc/top.html
http://www.shrines-gate.sakura.ne.jp/
http://13cm.jp/
http://satsuki-yamai.net/
http://madaraya.web.fc2.com/myhomepage/index.html
http://kmnsmie.x.fc2.com/index.html
http://www.geocities.jp/yukihanaok2/block/sample.html.html
http://yarinokoshi.blog88.fc2.com/
http://500mips.sakura.ne.jp/
http://playpray.com/royal/box.html
http://r1200gs.x.fc2.com/top.html
http://sirokakko.nobody.jp/
http://ceden.x.fc2.com/list.html
http://ratebakko.blog73.fc2.com/
http://zona.rossa.cc/
http://misao.sonnabakana.com/frame_link.html
http://gorogorororo.x.fc2.com/block/01/neko01.html
http://origina.jp/ - Known links: http://origina.jp/public/janken_v1.swf - http://origina.jp/public/komiji_clicker.swf
http://oukateitoku.web.fc2.com/index.html - Known link: http://oukateitoku.web.fc2.com/main01.html
http://philistines.main.jp/re/framepage3.html - http://philistines.main.jp/re/block/bro2/sample.html
http://tanukinosuana.saiin.net/index2.html - http://tanukinosuana.saiin.net/block/kakusui/block_kakusu_01.html
http://hannari.moe.in/main.html (old)-> http://rinrin.saiin.net/~finallife/
http://web.archive.org/web/*/http://masmi.neko.ne.jp/* (Flash, Java?)
http://girlsbravo.sakura.ne.jp/frameGamez.html (Flash, Java)
http://icydoll.x.fc2.com/top.html (Flash, Java)
http://monsteboxf.sakura.ne.jp/index.html (Flash, Java)
http://syokusyu.jpn.org/game/CG/index2.html (Flash, Java)
http://ura2b.dojin.com/ (Flash, Java)
http://bullpup.net/ (Flash, Java)
http://haruka.saiin.net/~gtks/gtksgame/games.html (Flash, Java)
http://red.ribbon.to/~nikochan/top.htm (Flash, Java)
http://burstbomb.sakura.ne.jp/top.html (Flash, Java)
http://headless.sakura.ne.jp/game.htm (Flash, Java)
http://www.shiitake.tv/index2.html (Flash, Java)
http://aria.saiin.net/~nekoru/pcp/index2.html (Flash, Java in "Block" section)
http://stsepia.sakura.ne.jp/top.html (Java, also in .zip files)
http://ava.sakura.ne.jp/cgi/jangoro/jangoro.html (Java)
http://silste.sakura.ne.jp/A-cup.html (Java)
http://soleil-lielos.net/ (Java)
http://mitei.x.fc2.com/bakuretublock/001.html (JavaScript)
http://ryumage.sakura.ne.jp/ (Flash, HTML5, Unity)
http://www1.kiy.jp/~yoka/ (Flash, Java, HTML)
http://www117.sakura.ne.jp/~nyano/top.html (Flash, Java)
http://jyabuki.web.fc2.com/ (Flash, Java)
http://red.ribbon.to/~omi/muki/ (Flash, Java)
http://studio-ray.jp/ (Flash, Java) (some of these want a password to access them)
http://www111.sakura.ne.jp/~cothurnus/Main.html (Java)
http://bhwug.k-server.org/frame.html (Java)
http://www2e.biglobe.ne.jp/~earth/ (Java)
http://notfound.wewe.jp/index.html (Java)
http://toko.x.fc2.com/ (Java)
http://cross-do.com/game/index.html (Java)
http://amiyumi.h.fc2.com/adult/adult.htm (Java)
http://yoshimi50.h.fc2.com/ (Java)
http://www.suzune.uh-oh.jp/main.html (Java)
http://takumaru.com/ (Java)
http://www.e-bunny.net/ (Java)
http://linseed.sakura.ne.jp/index2.html (Java)
http://www7.plala.or.jp/gmstyle/index.html (Java)
http://ikyu.sakura.ne.jp/index2.html (Java)
http://sakamihara.dousetsu.com/ (Java)
http://chararin.chew.jp/ (Java)
http://www.pink.ne.jp/~mint/ (Java)
http://0left.fur.bz/ (Java)
http://mizuki.sakura.ne.jp/~nanbu14/ (Java)
http://path.mizubasyou.com/menu/menu.html (Java)
http://www.geocities.jp/mizunoiro7/index.html (Java)
http://satousu.net/index.html (Java)
http://roundnext.fc2web.com/frame.html (Java)
http://saboten.sakura.ne.jp/~d-reita/ (Java)
http://red.ribbon.to/~cracker/gameroomentrance.html (Java)
http://w-h.sakura.ne.jp/index.html (Java)
http://www17t.sakura.ne.jp/~inu-bosi/main_f.html (Java)
http://www.hada-y.com/block/ (Java)
http://ddoodd.ddo.jp/delta/index.html (Java)
http://nekoman9.x.fc2.com/ (Java)
http://okahara.x0.com/ (Java)
http://sou-mikagami.la.coocan.jp/main.html (Java)
http://red.ribbon.to/~mizusa/index2.html (Java)
http://marshmallow.nobody.jp/ (Java?)
http://bakuretuken.com/ (JavaScript) (this is the maker of the Java-based Breakout/Arkanoid clone engine you'll see a lot of)
http://www.ngy.1st.ne.jp/~motar/ (Shockwave, Java)
http://saboten.sakura.ne.jp/~vari/ (Java)
http://www.yamabuki.sakura.ne.jp/~ilek-vad/ (Java)
http://red.ribbon.to/~agluna/index2.htm - http://red.ribbon.to/~agluna/block/ranblock.html (Java)
http://www.gt.sakura.ne.jp/~fw2/ - http://www.gt.sakura.ne.jp/~fw2/block/block_normal.html (Java)
http://myuratch.sakura.ne.jp/ - http://myuratch.sakura.ne.jp/kuzushi/kuzushi.html (Java)
http://almax.sakura.ne.jp/page004.html - http://almax.sakura.ne.jp/fg/sadloli1/indexsp.html (not sure)
http://hijirino.sakura.ne.jp/top.html - http://hijirino.sakura.ne.jp/game-main2.html (not sure)
http://www.kinomoto.ne.jp/kem/ (Java)
http://www5b.biglobe.ne.jp/~sgc/top.htm (Java)
http://yaxahuxa.x.fc2.com/ (Java?)
http://zero0804.fc2web.com/frame.html (Java)
http://red.ribbon.to/~gamu/new-index.html (Java)
http://endlessend.h.fc2.com/frame.html (Java)
http://cat-rice.sakura.ne.jp/html/frame.htm (Java)
http://www.nadeshiko.sakura.ne.jp/~kazuna/top0805.html (Java)
http://shojodrop.sakura.ne.jp/9/sd/frame.html (Java)
http://www5b.biglobe.ne.jp/~sarugoya/main.html (Java)
http://f2s.jog.buttobi.net/ (Java)
http://www.highranda.com/ (Java, JavaScript)
http://menad.web.fc2.com/ (Flash, Java) (old)-> http://web.archive.org/web/*/http://www.d1.dion.ne.jp/~k_miyabe/
http://www111.sakura.ne.jp/~erohouse/ (Flash, Unity)
http://web.archive.org/web/*/http://rinrin.saiin.net:80/~uminn/*
http://www.milele.me/ (not sure)
http://jhnet.sakura.ne.jp/ (not sure)
http://tarouyamada.pvj.jp/ (not sure)
http://www12.plala.or.jp/zemex/block/top/top.htm (Java?)
http://bulls-ai.just-size.net/toppage.html (not sure)
http://www.studio-beast.com/ (not sure)
http://teru.h.fc2.com/Game.htm (not sure)
http://llauda.sakura.ne.jp/lll/ (not sure)
https://www.tomatama.com/main.php (not sure)
http://osawariman.y.ribbon.to/index2.html (not sure)
http://pavilion-ellese.com/game/ (not sure)
http://sumicco.rdy.jp/ (Java?)
http://joyusinsui.webcrow.jp/ (not sure)
http://marimo-w.sakura.ne.jp/index.html (not sure)
http://eroinunununu.bake-neko.net/ (not sure)
http://loliloli.ddo.jp/ (not sure)
http://stellalafell.sakura.ne.jp/ (not sure)
http://kedadamo.com/aw/index.html (not sure)
http://lionz.from.tv/ (Flash, Java, HTML5)
http://sigeki.h.fc2.com/ohureko_index.html (Flash, Java)
http://taisai.sakura.ne.jp/ (Flash, Java)
http://oopstudio.x.fc2.com/ (Flash, Unity)
http://web.archive.org/web/*/http://chibitami.net:80/*
http://web.archive.org/web/20140915041817/http://nanako.upthx.net:80/game.html
http://web.archive.org/web/20140426201857/http://lofigirls.dip.jp:80/inamori/top.html
http://web.archive.org/web/*/http://komachi.8ne.jp/*
http://web.archive.org/web/*/http://zrealm-cgflash.oneself.to:80/* (Flash, Shockwave)
http://web.archive.org/web/*/http://www.k2.dion.ne.jp/~k-getsu/*

Unknown site layout:
http://strawberryshop.h.fc2.com/b_game/gblock.html (mostly Java)
http://strawberryshop.h.fc2.com/b_game/g2block.html
http://strawberryshop.h.fc2.com/b_game/edoblock.html
http://strawberryshop.h.fc2.com/b_game/g_nekoblock.html

http://yuaaia.web.fc2.com/raina/raina.html
http://yuaaia.web.fc2.com/maria/test1.html
http://yuaaia.web.fc2.com/ruka/a1.html

http://realeyes.h.fc2.com/top.html - http://realeyes.h.fc2.com/deibl4.html
http://hpdkeiryu.x.fc2.com/ (?)

http://blue.ribbon.to/~niya/ don't really know if anything's here
http://blue.ribbon.to/~niya/80310hatena/index.html (Java?)

http://www.geocities.jp/sakura50yume/block/block01.html (Java)
http://www.geocities.jp/sakura50yume/quicks/lucy/

http://g6triglav.web.fc2.com/mioblock/sample1.html (Java)
http://g6triglav.blog94.fc2.com/ (not sure if anything here)

http://web.archive.org/web/20121025070740/http://setsunasamidare.h.fc2.com:80/mainf.html
Games are still up, but I can't find them on the main site.

http://web.archive.org/web/20171212124335/http://nx.jpn.org:80/~malce/muramasa/ (Flash, Java)
http://web.archive.org/web/20170511233134/http://nx.sakura.ne.jp:80/~malce/muramasa/ (same site)
Games are still up, but I can't find them on the main site.

http://web.archive.org/web/20151125184305/http://romaneko.x.fc2.com:80/game.html (Flash, Java)
Most games should still be up except this page.

http://web.archive.org/web/20120708155609/http://pumppump.x.fc2.com/game.htm (Flash, Java)
Games are still up except this page.

http://blueskystarlysky.web.fc2.com/
http://blueskystarlysky.web.fc2.com/miokuzu/miokuzu.htm (also another version on page)

http://murabito.sakura.ne.jp/scm/
http://murabito.sakura.ne.jp/tmp/bk_alice.html

http://no-reply.but.jp/
http://no-reply.but.jp/mikotokuzushi/lunaticmode.html

http://artjam.sakura.ne.jp/
http://artjam.sakura.ne.jp/game/fblock/002.html
http://artjam.sakura.ne.jp/game/game3/Normal.html
http://artjam.sblo.jp/

http://red.ribbon.to/~kingdom/
http://kei69gou.blog97.fc2.com/

http://kachusha.angelic.jp/
http://kachusha.angelic.jp/bb_top.htm (Java)

http://www5d.biglobe.ne.jp/~eyes-tk/
http://www5d.biglobe.ne.jp/~eyes-tk/game.html

http://dacotu.jpn.org/
http://dacotu.jpn.org/game/index.html (Flash, Java)

http://jigokubeya.kt.fc2.com/nako/nako.html (Java)

http://azukinonae.web.fc2.com/b3/sample1.html
http://azukinonae.web.fc2.com/b3/sample2.html
http://azukinonae.web.fc2.com/b5/sample.html
http://azukinonae.web.fc2.com/bbb3/sample.html
http://azukinonae.web.fc2.com/bb/sample.html

Mostly Java:
http://www.ni.bekkoame.ne.jp/ruly/indexx.html
http://www.ni.bekkoame.ne.jp/ruly/ura13/sagi01kw.html
http://www.ni.bekkoame.ne.jp/ruly/ura13/tatesuji.html
http://www.ni.bekkoame.ne.jp/ruly/ura13/arau.html
http://www.ni.bekkoame.ne.jp/ruly/ura13/2_yukika.html
http://www.ni.bekkoame.ne.jp/ruly/ura13/tatesuji.html

HTML5?
http://lukacandy.r.ribbon.to/GameSystemMarkIII/b4510.html
http://lukacandy.r.ribbon.to/GameSystemMarkIII/b1988.html
http://lukacandy.r.ribbon.to/GameSystemMarkIII/b2385.html

These 2 are linked:
http://necocoya.mints.ne.jp/free.html (this is the maker of the Flash-based Minesweeper clone engine you'll see a few of)
http://nccybox.sdbx.jp/mouswU01/mouswU.html - http://nccybox.sdbx.jp/nccySample/ = Unity archive?

These 2 are part of the same site:
http://kipimix.com/ - http://kipimix.com/taihai2.htm
http://kipimix.sblo.jp/

These 2 are linked:
http://gust0050.x.fc2.com/
http://osayou.net/

Not sure how this site works:
http://rip-lip.com/
Known links:
http://rip-lip.com/contents/start_01.html
http://rip-lip.com/contents2/start_02.html
http://rip-lip.com/contents3/start_03.html
http://rip-lip.com/contents4/start_04.html
http://rip-lip.com/contents5/start_05.html
http://rip-lip.com/contents6/start_06.html
http://rip-lip.com/contents7/start_07.html
http://rip-lip.com/contents8/start_08.html

http://natukon.mints.ne.jp/
Known links:
http://natukon.mints.ne.jp/block/osanpo/index.html
http://natukon.mints.ne.jp/block/c74zansho/index.htm

http://www.nekonta.com/ (already listed as scraped, probably covered the full site)

http://barbarian.x.fc2.com/animation.htm
http://web.archive.org/web/20150509004020/http://barbarian.x.fc2.com/game.htm (also Java)
Games should still be up, but this page doesn't work.

http://fetish-fairy.sakura.ne.jp/ (also JavaScript)
http://fetish-fairy.sakura.ne.jp/miniGAME/20130224_game_JpegPuzzle/jpuzzle.html
Not sure how to find through site, might have to check blog for more.
http://fetishfairy.blog2.fc2.com/

These 2 are related:
http://syaraku.moe.to/top1.html (nothing here, just DLSite links?)
http://park3.wakwak.com/~doronpa/old/index-flm.html

These 3 are part of the same site:
http://www.erofla.com/index.html - http://www.erofla.com/flash/old/01/01.html
http://eflabo.sakura.ne.jp/
http://ef-labo.sblo.jp/

These are linked:
http://beastmodeblock.blog.fc2.com/
http://beastmodeblock.x.fc2.com/ - the blog has games not listed here which have this domain

http://znzn.o0o0.jp/data/
http://zenulog.blog.fc2.com/blog-entry-24.html - password for each of these game links is "ryona".
I think one of them is Unity, but I haven't checked the others.

http://3c9game.sakura.ne.jp/
http://3c9game.x.fc2.com/main.html (not sure of game formats)

I guess the "R-18" section requires a password.
http://toten.jp/
http://toten.jp/hkkuzusi/hk.html
http://toten.jp/ntkuzusi/nt.html

Not sure of the formatting of this one:
http://samayoeru.x.fc2.com/bb/select.html
http://samayoeru.x.fc2.com/blockbreak/first.html
http://samayoeru.x.fc2.com/akabb/first.html

This is played in this order:
http://nigesapo.x.fc2.com/
http://nigesapo.x.fc2.com/hutu2komi.html
http://nigesapo.x.fc2.com/3ple.html

http://web.archive.org/web/20180429035950/http://www.e-ohkoku.jp:80/main.html
http://ohkoku1.blog.fc2.com/
http://www.e-ohkoku.sakura.ne.jp/

http://simplehouse.sakura.ne.jp/ (also Java) - I'm confused
I was linked here with this URL, but this one isn't listed in the "Gallery":
http://simplehouse.sakura.ne.jp/game/ms05/ms05.html
I decided to type this one, since it's not listed:
http://simplehouse.sakura.ne.jp/game/ms03/ms03.html
It technically existed at some point? The blog might mention something, but I don't feel like looking.
You should check unlisted URLs and Wayback.

This is a general mix site; the NSFW version of https://freegame-mugen.jp/
https://elog.tokyo/genre/os_browser.html
https://elog.tokyo/tagcloud/
https://elog.tokyo/tagcloud/Unity_1.html
https://elog.tokyo/tagcloud/Flash_1.html
SFW version also has Java and HTML5.

http://flash.jp-sex.com/ - Flash is supposed to be stored on flash.shard.jp, but that site seems to be dead.

English:
http://gamcore.com/
http://h-flash.com/
https://www.comdotgame.com/ - half SFW
https://sexhotgames.com/
https://adult-sex-games.com/
https://www.gamesofdesire.com/
http://www.2adultflashgames.com/
http://www.sexygames.dk/
https://www.hornygamer.com/
https://onlinexxxgames.com/
http://www.gamesbang.com/
https://wetpussygames.com/
https://www.stripparadise.com/
https://www.sexgames.cc/
https://www.hentai-gamer.com/
http://www.pornogames.xxx/
https://playforceone.com/ (HTML5?)
http://web.archive.org/web/*/http://109.236.86.128/* not sure if site works
http://web.archive.org/web/*/http://23.29.114.170/*
http://web.archive.org/web/*/http://217.23.12.240/*
http://web.archive.org/web/*/http://japanimoo.com/*
http://pornwebgames.com/ - Redirects to h-flash.com
---
These are linked on flashff-blog.com
http://216.155.129.196/astd/ - open directory
http://216.155.129.196/newserver/new_games/room-escape.swf
http://216.155.129.196/videos/asg/meikou.swf
http://web.archive.org/web/*/http://216.155.129.196/*

Lists of sites:
http://e7c.net - I think I did all of it. Most pages link to the following sub-domain:
http://ero.e7c.net/adlist/flash/34.php - This is mostly useless, but I've checked up to this page for the red button on the page which links off-site. I went through 300+ entries, only found around 25 buttons.
http://flashff-blog.com/ - pretty much just started on it, some files are embedded
http://blog.livedoor.jp/mea_tadaero/ - Large blog I mostly finished looking through. Some are embedded, and others are on cloud storage.
I'm not sure what format the downloadable games are as I don't plan on checking them.

Some basic search terms:
site:geocities.jp "フラッシュゲーム"
site:geocities.co.jp "Flashゲーム"
site:sakura.ne.jp "Flashゲーム"
Others include fc2.com, biglobe.ne.jp & tuzigiri.com.
This should cover many defunct & active GeoCities-type sites that are tied to ISPs:
https://ja.wikipedia.org/wiki/Wikipedia:ISP%E7%AA%93%E5%8F%A3
Some defunct ones not listed include:
atpages.jp - closed February 28 2018
freett.com - closed March 31 2016
Many MUGEN characters were Wayback'd by moi from freett.
Subdomains are page.freett.com & big.freett.com.
MUGEN pastebin will be coming next.
Make sure the quotations marks are included.
Both say "Flash Game", but "Flashゲーム" will probably get more hits.
Flash archival project:
https://bluemaxima.org/flashpoint/