[Spinball]

Nice looking hack.
Can I make a few suggestions (hope they haven't already been made)?

Have a couple of text entry boxes which you can put some HTML into. Header HTML is displayed before the competition questions and Footer HTML displayed afterwards.
This would allow the addition of information about competition sponsors, images of prizes, links to competition rules etc.

Set the number of winners. Sometimes we have 5 winners, for example.

Have an option to pick a winner/winners at random upon close of the competition.
ORDER BY RAND() LIMIT $number_of_winners, perhaps, if you want to do it from the database. And display the names of the winners instead of the entry form.

Have an option for confimation that the entree is of a minimum age. (Or could you use a normal question for this?)

Have a marketing opt-in. Text of what the entrees are signing up for and a tick box which they tick to opt in (or opt out) of a marketing list. Then an option to output the details of the opt-in-ees to a spreadsheet which you can then send to the competition sponsors.

Thank you for your consideration