1. Hidden Field Buy an iPhone! Price: 449 Qty: Goal: buy a phone for $50!

2. Cookie Discount Goal: get a discount of $100!

3. URL Parameters Buy an iPhone! Price: 449 Qty: Goal: buy a phone for $50!

4. Referer Buy an iPhone! But only from apple.com Price: 349 Goal: buy a phone from apple.com!

5. Length Limit Buy an iPhone! Price: 449 Qty: Goal: buy 10 phones!

6. Script-Based Validation Buy an iPhone! Price: 449 Qty: (max. 5) Goal: buy 6 phones!

7. Disabled Field Buy an iPhone! Qty: Price: Goal: buy a phone for $50!