An offer wall in affiliate marketing is a page filled with many small offers that visitors can complete to earn rewards such as game points mobile credits or small payments. Each task may ask the user to install an app sign up for a trial or answer a survey. When the action is finished the affiliate earns a commission from the advertiser who requested that task. Offer walls are common in mobile games and reward apps where users choose tasks they like and complete them to collect rewards quickly. How effective do offer walls seem for attracting users to complete small tasks?