Guardian game reviews: Mini Metro; Citalis; Sega 3D Classics Collection

A simple idea, executed superbly, which fits the hand-held market to perfection, Mini Metro works despite the rather unglamorous premise of playing as an underground transport designer of a minimalist world, where stations and passengers are plain, geometric shapes.

The various cities start with a river and three stations that can be connected. Passengers ping into existence needing to be ferried to destinations matching their outline, while periodic new destinations must be integrated into the growing network. The screw is then turned as both the geography and variety of station shapes are steadily expanded.

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