I did a similar thing earlier this year, combining LNbits newly released Cashu and locked cryptpad.fr documents :)

Hiding Cashu tokens in a password document like this with: https://cryptpad.fr/pad/#/2/pad/view/zLGCTp2z+NOxBXQSoolHjG+GA5BCgkQyqHpe6lWBe0c/p/

Password hint: This website, hm....

And those who first & correctly reply to your quiz can redeem their sats in your own cashu-mint bank, like this one: https://legend.lnbits.com/cashu/mint/NhEdb2uToFxV5UTRY3oysQ

What you can do with the lightning network is really cool, this above even works if the user doesn't have their own LN-wallet :)