Challenging is always a nice way to put it. Really, really tough is another. Perhaps, think, man! You can do it! What a trip this scenario is for your Evil Application. This will you keep you occupado for awhile. Great use of transitions, water, elevators. Does the word hidden count? This reviewer was sweating when we realized that Mr. Jacob had thoughtfully provided a "walk-through" Film. Have to have it. Dare you to download & succeed without it. The end of the film may have you cracking up (is that a bug?).