You be the judge, this was done in 30 min (most of the time working with a new plugin, Sweet Alert in C3.)
Took the flappy bird template, added random math questions which pause the game, if you are correct continue, if you are wrong, the game speeds up.
(Most) of the Events added:
If this looks too complicated, I would suggest to look for other tools. If it looks easy, go for it!
High score is more complicated, but there are tutorials on the site (I use Gamesparks, but there's a decent learning curve on that one.)
(FYI the Sweet Alert plugin does not fully work C3 right now, so if you want to use the nice text box, you may want to start with C2 instead.)