Hacking I've always wondered... What IS this game that my DS flash cart pretends to be?

[Rubedo]

 

[FAST6191]

Usually localised as something like Nazonazo & Quiz - Ittou Nyuukon Q-Mate!. なぞなぞ & クイズ一答入魂Qメイト! for some Japanese.
Video of the intro and title screen
https://www.nicovideo.jp/watch/sm25115708

ROM stuff Not sure which version it is offhand (there is a demo and some other stuff).
http://www.advanscene.com/html/Releases/dbdswrel.php?id=2852
http://www.advanscene.com/html/Releases/dbrelds.php?id=2530
https://gbatemp.net/threads/ds-xxxx-nazo-nazo-quiz-ichi-kotae-jikkon-q-mate-demo-japan.95312/

Why we have faked games for DS flash carts these days
https://hackmii.com/2010/02/lawsuit-coming-in-3-2-1/

Bunch of other links
https://e3-komachi.at.webry.info/200807/article_4.html
https://www.siliconera.com/2008/05/15/konami-tests-knowledge-with-nintendo-wi-fi-quiz-game/
https://www.yesasia.com/us/nazonazo...e-japan-version/1011038184-0-0-0-en/info.html
https://www.nintendo.co.jp/ds/software/yixj/index.html
http://kakakissi.game.coocan.jp/ds/qmate/index.html
http://www.7wonders.co.jp/list/game/なぞなぞクイズ一答入魂qメイト/
https://www.famitsu.com/games/t/1378/
https://web.archive.org/web/20130726131111/http://www.konami.jp/Qmate/
https://gamefaqs.gamespot.com/ds/946381-nazo-nazo-and-quiz-ittou-nyuukon-q-mate