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!