A new release on Steam caught my eye earlier today: one Mini Metro, an abstract puzzle game based around the idea of subway systems. Feeling like taking a punt on something unusual, I downloaded it and was delighted to discover a simple to understand but tricky to master puzzle game with some highly original, interesting mechanics and a gorgeous, clean aesthetic.

Mini Metro places you in charge of the subway system of one of several cities around the world. The city itself doesn’t make a huge amount of difference save for the map on which the gameplay is based: most of them have some sort of body of water which will require you to construct tunnels or bridges to traverse, and you only have a limited number of these to use.

The mechanics are simple: stations appear across the map, represented as large shapes. At each station, small shapes appear to represent commuters. The shape of the commuter represents the station they want to get to. They’re not fussy about which one of several identical stations they get to, but they most certainly do want to get to, say, a “triangle” station. In order to fulfil their requests, you need to draw coloured subway lines between the stations in order to set up efficient routes. You begin with just a couple of available colours, but as each in-game “week” passes, you have the option of adding more lines to your network — though you have to be careful, as if you don’t have an actual train to put on the line, it’s not much good to anyone!

As the game progresses, more and more stations appear and the map zooms out to expand the available playing area. Certain stations may be replaced by unique symbols such as stars or pentagons, too, forcing you to ensure that these stations have good access from all lines, or at least a relatively straightforward route of interchanges to use. In order to manage with the growing requirements of your city’s commuters, each “week” you get a new locomotive to add to your network, as well as the choice between either a new colour of line to add or an extra carriage to add to one of your trains, improving its capacity. Using these upgrades effectively is key to success just as much as laying out your lines carefully.

There’s a few different ways to play, too: the standard mode simply ends when one of your stations becomes overcrowded, the endless mode keeps playing regardless of overcrowding, and the Extreme mode forces you to live with your mistakes, as unlike the normal mode you are unable to edit your lines or trains once you’ve put them down. There’s also a Daily Challenge mode, where everyone gets the same level to play on a given day, and competes for the best ranking on leaderboards.

I’ve only played about an hour of Mini Metro so far, but I anticipate it being one of those games I dip into every so often when I have a few spare minutes to while away. It’s an understated, fun little game with some excellent mechanics and a lovely aesthetic, and if you’re a fan of more abstract games it’s well worth a look.