Today is one of those nice days where Amazon's Free App of the Day is far more than just a single app. Of course, just one of them may make it all worth it. Five Nights at Freddy's 2, the popular survival horror game, is among the free choices and you even get a $1 MP3 credit just for downloading. Yep, even if you don't have the slightest interest in it, you should probably download it and buy yourself a song.

The occasion is the Appstore's fourth birthday, so another side benefit is that a single download enters you into a drawing for a $25,000 reward.

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