What is the ruling of the Shari'ah concerning a Ramadan competition for which a voucher must be purchased to participate, whose questions are selected from television programs, and whose prizes are very large (such as a car and a house)?

The described scenario is considered gambling (qimar) because the participant pays money, which then circulates between gain and loss. This is the very essence of gambling, in addition to the potential Shariah prohibitions that might be present in television programs.