I'm changing this thread. From now on, whenever there is a really good game listed as Amazon's "Free App of the Day," I'll be posting to this thread with info about it. Anyone can feel free to reply to this thread whenever there is some good game that is available as the Free App o' the Day for Android.
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Featured as the Free App of the Day on Amazon.com, Terraria (Android version) is available for free but only for today, Christmas (or for the non-Christian types, Dec. 25). Normally it costs $4.99.
Terraria is an excellent game: imagine a 2D version of Minecraft but with all the recipes for crafting things LISTED IN THE GAME ITSELF rather than having to search the Internet for the info; and instead of being, "Yeah, go wherever, you figure it out," Terraria is much more "game-orientated" with progression and lots of bosses and enemy types.
Let me know if you pick it up!