Tombola is a form of raffle in which prizes are pre-assigned to winning tickets. Prizes can be physical prizes with numbers displayed on the item at an event. To win the pre-purchased ticket number has to match the number on an item displayed. The item can also be an envelope with a voucher or gift certificate inside.
The online version of Tombola is where a ticket is purchased which provides access to a mystery download. This can be an e-book or gift voucher. This way the purchaser knows straight away what they have won.
Items can be displayed on the website to generate interest but without the numbers allocated for the item.