Minecraft, everyone's heard of it. You've probably played it, so I don't really need to tell you about the game itself. I find 'plain' minecraft boring. There just isn't enough stuff you can get, I prefer Terraria - there's so many items you can get. When I play MC I play it with mods, and I also use a texture packs.
Flan's mod screenshot.
If you're lazy, or don't know how to add Texturepacks and Maps to MC there's a tool you can get on Skydaz, that does that for you. I like it. Here it is.