Background
I met a devil who wants to play a game with me.
We will flip coins until one shows tails.
Once that happens, I can keep all the coins except for the one showing tails.
All I need is to pay some coins in return.
Sounds like a good deal, doesn't it?
The game
I flip a coin.
If heads, automatically flip another coin and repeat the process until tails.
If tails, I gain all the coins except for the one showing tails, and the round is over.
For every 5 rounds, the devil will charge me some coins.
Can't wait to become a millionaire!
Devil's offer
Every time the round is over, the devil offers three items for sale.
I can use the coins I earned from the previous round to purchase those items.
Those items will make my next round better!
The devil is too kind for me!
