Before you ask, no, you won't learn how to replace your busted clutch or how to find that squeaky sound underneath your car- it's not that type of game. What you will find, however, is a great puzzle game that is a breath of fresh air compared to the thousands of other puzzle games out there.
The premise is simple: you own a mechanic shop, and people bring you cars (problems) to fix. You get a short blurb to tell you a bit of information, but the amount of information that you get can vary- going from "Hey, my battery is dead, can you fix it?" to "Something squeaks under the car. Fix it." Your goal is to find and fix the problem while trying not to run out of cash- you get an extra amount of cash for each order, and if that runs out, you can ask the bank for a loan that you have to pay back. To be honest, though, if you're careful about what you buy and aren't replacing stuff willy-nilly, you ought to be fine. Just remember- fix it if you can, or replace it outright if you need to.
And don't worry about losing parts- the game will not only make you remove items in order off the car, but it will also force you to put them back in order, as well- there's no need to worry about missing any parts- unless it's something like a starter or a plastic engine cover, but even then it won't let you mark it as done until the car is completely put back together.
Once each objective is met, you'll be able to mark the car as "fixed" and send it on its way.
There are over seventy problems in the base game alone- plus another twenty in the DLC pack that comes free with the game. There's another free DLC pack launching later this month with another pack of problems, and that will add even more value to it.
The problems I have with this game are actually somewhat slight- for one, some of the detection on th orders can be really, REALLY picky. If it tells you to replace the right front tire, then your new wheel must go on the right front- you can't just move a used wheel from the other side of the car onto there, because it's not explicitly a new wheel. It's smart to take big orders a step at a time for this reason- work on one region of the car at a time, and replace everything needed- or make notes as to what the busted parts were. There is nothing more swear-worthy in this game than completing a huge order, but being unable to continue because you didn't put some tiny part back in its right space- and then you have to pull the whole blasted thing apart to hunt for it.
The only other complaint I have is that you will want to hit the radio with a wrench and kill it dead after a half-hour of its awful music. If you need music, bust out an iPod or turn on an actual radio, because this one will make you want to take it out to the test track and drive over it a few dozen times. Would it have been too much to ask to get a simple MP3 player in there or something?
All in all, though, if you're looking for a puzzle game that isn't something about jewels, you'll enjoy this- especially if you have an interest in cars.