Abstract: An Internet-based service configured to operate a scavenger hunt in which participants are required to answer questions using information obtained from one or more Web sites visited in response to hints suggesting where such information may be located. Each preceding question must be successfully answered before a next question is presented. Generally, a correct answer requires verification that a respondent visited the Web site at which the information required in the answer is located. This, in turn, may require that the respondent reached the Web site at which the information required in the answer is located through an authorized path including at least one predetermined Web address. Such verification may be achieved by using referring uniform resource locator (URL) information regarding the at least one Web address as a security key to allow access to a location at which the respondent may enter the answer.