D.VA has her fair share of gadgets and do-dads that she’s scrapped together with scrap she’s found at base and other places. One of these gadgets is a seemingly harmless handheld console called the Gamekid.
The Gamekid is a customized console that doubles as an entertainment system when things get slow and a miniature weapon of mass destruction. The Gamekid is a detonator that sets off 'Cartridge bombs', another seemingly harmless looking item up until it's put into action.
With this she can play Mario and blow up some fools, it's the best of both worlds really.