Smooth  polished  and the text-chat interface concept is a brilliant idea that is very well implemented here. I grew up in the 1980s playing these Infocom titles  and while I go back to them every so often as an adult  I've yet to get that same feel from mobile Z-machines (such as Son of Hunky Punk  which otherwise is also good). The chat-text interface here is the perfect transition to modern mobile platforms for these games  and I'm frankly amazed that no one had thought of it before. As others have mentioned here  the only real point of frustration I have is the lack of .z4 support  which eliminates later classic Infocom titles such as A Mind Forever Voyaging. But for about 70-80% of Infocoms and virtually anything produced in the Inform era (post-1997 or so)  this Z interpreter is just spot on. I'm giving this five stars  because it deserves it  even without .z4 support. With .z4 support  I'd be petitioning Google to make a six-star rating possible.
January 25 2017