Inside Outing

Inside Outing is an isometric arcade adventure game. An eccentric millionaire has died without leaving a will, instead hiding his money and gems in obscure places around his large house. His widow has hired a professional thief to find and retrieve these items. However, the dead millionaire's strange pets have now overrun the mansion and do not take kindly to interlopers. The player controls a thief, named "Raffles" in some versions of the game and "Devon Aire" in others, who must explore a large mansion looking for valuables, while avoiding the various hostile creatures that inhabit the house.

Source: Wikipedia, "[en.wikipedia.org/wiki/Inside_Outing Inside Outing]", available under the CC-BY-SA License.