When planning a chance-based competition it is important to consider how many times you want to allow one individual to enter.
If you do not require a purchase to enter and fail to place a limit of the number of entries per person, you may end up with one individual entering hundreds or thousands of times! This could be seen to be unfair to other entrants. If your competition terms and conditions fail to note any limitation there is nothing to stop one person from entering your competition multiple times. The terms and conditions that you submit to obtain a competition permit must consider and be clear about these requirements.
Other strategies you may wish to consider are requirement to verify entry via email, systems in place to stop multiple entries from the one email or one IP address. Contact us for other ways to limit this risk.