How can we ignite somewhat sleepy/lazy brains?

I just had an insane idea - no guarantees - you’ll need:

• a small dev team
• a whiteboard
• a sudoku puzzle generator/magazine/whatever

Instructions:

1. Write down the sudoku puzzle on the whiteboard and cover it with something.
2. Mark the time
3. Let the team solve it
4. Mark the time elapsed
5. Profit

Would it work? Any neat ideas to share?

Inspiration shamelessly taken from softwarebyrob.com