Driven by a sense of Chinese normality that contrasts nicely with the utopia of the city-state of Avalon, SHENZHEN I/O offers a refined challenge for engineering enthusiasts. In a loose replica of reality, the game creates challenge through artificial limitations that make sense and do not obstruct the satisfaction of achievement. An invisible face in a booming business, our avatar gets to rub shoulders with a fun cast and an exceptional variety of puzzles: few flaws to be found, other than the absence of certain themes in the main campaign – as is not using the Math Co-Processor, the FM-Blaster or the various logic chips.