Trackmania is a racing game for PC which can be played online. Unlike other racing games, all cars have the same stats, so there is no advantage in what car you have. In fact, the only difference between the cars is the colour, which you can design yourself, though others will only see a nation's flag worked around the car.
The cars are very much like F1 cars, and we have had the talk from the people who build F1 cars that thehy could drive upside down. Well, in Trackmania it is actually possible. Due to the unique way tracks are created - by player creation on a player created server - some of them have parts where there are loops, walls to drive on and even tunnels which require you to drive upside down. The cars are extremely fast and precision comes into play, especially when on a shorter track. Some races come down to the 100th of a second, this is because the races are in a time trial format, where a certain amount of time is given to get the best time possible. If your time is good enough it will be uploaded to the server for that track.
Not only is there the multiplayer online mode, but also a single player mode with the same objective, to get the quickest time. If you get below a certain time, you will be rewarded with a medal.
All of your accomplishments add up to give you your ranking. Other than this, there is no reward.
This is a free game, but there is also a one off purchase version, where you can further customize your cars' looks, allow others to see your customizations and also a race for coppers mode, where you bet coppers on a race.
This game is definately worth downloading, despite its download time, even just to have a go. Make sure you have a decent internet connection and customize the settings to match your PC specifications so that it runs smoothly.