Pong
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I wanted to see how quickly I could remake Pong in Unity, and this is the result. Took 1 hour and 33 minutes.
Source: https://github.com/foolmoron/PongExercise
Note: I obviously did not create Pong. If you don't know what Pong is, I highly recommend that you read about it (http://en.wikipedia.org/wiki/Pong). It's PRETTY cool.