Which traditional board game includes a doubling cube for raising the stakes?

Backgammon

Which monstrous creature guarded the gates of Hades? Who wrote the epistle that focuses extensively on love and abiding in God? Which fish is famously known for 'cleaning' algae off aquarium glass surfaces? What gas do animals primarily inhale for metabolism and respiration? What was the scandal regarding weapon sales to Iran funding Contras in Nicaragua?