<Tr> <Th_colspan="2"> Trivia Crack </Th> </Tr> <Tr> <Td_colspan="2"> Trivia Crack logo </Td> </Tr> <Tr> <Th> Developer (s) </Th> <Td> Etermax </Td> </Tr> <Tr> <Th> Publisher (s) </Th> <Td> Etermax </Td> </Tr>

What are the blue gems for in trivia crack