House of Diamonds and Queen's Castle are pinball machines released by Italian manufacturer Zaccaria in 1978. House of Diamonds is a four-player solid-state machine, while Queen's Castle is its single-player electro-mechanical counterpart. Both games feature a card and casino theme, incorporating four flippers, two bumpers, a kick-out hole, ten stand-up targets, two slingshots, a roll-under spinner, and a horseshoe lane.
