Need Facebook App developed

The app needs to work as follows:

- be placed on clients Facebook page, and only accessible after the user has 'liked' the page
- users then need to login with user details from the member's area of main site to access the app
- the app is basically a murder mystery, and so they get to read the story first and then rank ten pieces of evidence in order of importance. Depending on how well they achieve this section (i.e. how close to the ideal order) they get a different ending to the story.
- after completion, the app needs to post score to the user's wall and also prompt them to challenge their friends by inviting them to try and beat their score

This is quite an urgent piece of work, and so please provide your best price and examples of Facebook applications previously developed, as I want to award this job quickly.

Thanks for bidding!