Alpine Crawler is a game designed for Mac that comes in handy when you're on a break from work. The app features 6 challenging missions where your objective is to reach the finish line as fast as possible, without causing much damage to your vehicle.
You have access to a comprehensive help guide that teaches you how to control your vehicle, restart challenges, etc. After you check this manual you can start playing the game using your keyboard. There's also the option to use your trackpad to control your vehicle.
In my testing, the app worked great. It didn't ran slowly or used a significant amount of CPU resources while I was playing the game. Once I completed a challenge, the app automatically saved my score and allowed me to play the next level.
Unfortunately, the game provides you with a small amount of challenges (only 6). Also, its graphics didn't impress me much either.
Briefly, I think you can find better racing games to play on your spare time, without paying a buck. This app doesn't bring too much to the table.