Slot machine with secondary game content

A gaming apparatus comprising:

• c) a base wagering game apparatus comprising a processor, symbol display component and player input controls;
• and
• d) a secondary game element visible from the base wagering game, wherein the secondary game element comprises a virtual see-through container, a virtual fluid source and the processor is configured to move virtual fluid into and out of the virtual container;
• wherein winning outcomes in the base wagering game causes the secondary game element to change a visible virtual volume of liquid within the virtual container so that a changed level of virtual liquid within the virtual container can be seen, and when a predetermined level of virtual liquid is attained within the virtual container, a bonus payment or bonus game is initiated as a resolution of wagers placed through the player input controls.