#12: Final boss

Every player gets its own world, with a vault, an AMM and a lending market. Take everything the market holds and leave the vault's other depositor with nothing.

Call enter() to start (or restart) your world.

There is a toll before the mint: the flags contract wants to see your flag #10. Transfer it there and it hands it right back, but it only accepts the token id that the contract from #8 vouches for.