How can one make a transaction that any address can claim it just by solving the

I just learned that Mike Hearn created a Bitcoin Puzzle transaction where the first person to solve its scriptPubKey, could claim that transaction's amount as a reward.

The thing is... Aren't all the transactions forced to have a destination address? So, even if the winner solves the scriptPubKey, how can then he/she divert the funds to another destination address?