'The Game of Oil: A fascinating game, involving risks and big investments!' This game was released by Estrela, ca. 1975, licensed by Tomy Kogyo Japan. Players bet up to 4 chips each, putting them into a huge plastic oil rig and then pull the trigger. If the oil rig throws up the chips, players must follow the instructions printed on the secondary game board: earning or losing money accordingly. - BoardGameGeek