A NEWLY refurbished Oxford restaurant is offering brainy punters six months free food - if they can crack an 'impossible code'. 

Wagamama in George Street has appealed for people to take on a complex equation to be in with a chance of bagging a voucher worth £500.

The competition is being launched today, Albert Einstein's birthday, and is open until 10pm on March 21. 

Set by an Oxford University mathematician, the puzzle is as follows: 

Each number below encodes a letter of the alphabet. When you've worked out the letters, you'll need to unscramble them to make three topical words.

330 33 2 105 55 10 2 2 70 2 105 14 42 11 2 10 154 2 11 70 30 2 70

To enter visit Wagamama's Oxford branch and pick up a form.