Every cRPG should have a sophisticated randomized math puzzle that must be solved before the game can even be played.
WELCOME ADVENTURER
Before you proceed into the depths of this dungeon, solve this riddle to prove your worth.
THAT is actually a good idea but why
sophisticated?
Let's start with the basics:
Question 1.
9 + 27 = 0
(a) True
(b) False
Question 2.
1*1*1*1*...*0*...*1=?
(a) 1
(b) 10
(c) 0
(d) 1000
(e) $\infty$
Question 3.
Saint Peter's skull as a man is in a monastery in Athens and Saint Peter's skull as a boy is in a monastery in Rome.
(a) Plausible
(b) Implausible
The prospective player can get any two questions
wrong and the game will still let the player play, just not all questions wrong.
If they get all questions right, they start off with an extra healing potion or something.
If they get one or two questions wrong, they start off with a 10X health bar, because they'll need it.
If they open another window and ask ChatGPT/BingChat/... whether 9 + 27 = 0, it might say, "yes, obviously", and explain it, giving an essay of reasons, all of them incorrect. So it's resistant to the meta...
Edit. Or it could be like a hearing test. Getting a question right moves you up a level, getting one wrong moves you down a level, and you need to reach level 10 and stay there or above for a couple rounds to get the thing to start?