Essentially, 4-Color Taxi is the taxi mini-game from the isometric Grand Theft Autos with GameBoy visuals.
The taxi drives automatically through different sized cities and you steer with a thumb on either side of the screen.
You collect customers and take them to their desired location in order to earn enough cash to finish the level. Go faster and you get paid more.
Vehicle damage slows you but you can pay for repairs at any point, should you have sufficient funds.
It's an excellent time waster, and a solid homage to retro gaming, but it struggles to remain interesting past the first few levels.
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GTA: Chinatown Wars, Crazy Taxi, Reckless Racing 3