How to downgrade Minecraft?

I tried copy and pasting the minecraft.jar 1.5.1 files into my.minecraft jar file inside bin, and after, I delete the updated one. Once I go to minecraft, it stays frozen when it says Done Loading. What am supposed to do, or what am I doing wrong?

Is buying minecraft safe?

I desided to buy minecraft but I'm not sure if I buy minecraft they will take all my money until the credit card expires is it safe to buy minecraft?!

What Minecraft games are there?

I've never played Minecraft before and I want to try it because I've seen some videos on Youtube gaming channels. It looks pretty fun and interesting! I've realized that there's Minecraft Dinosaurs and Minecraft Hunger Games. Are there any others (example: any with animals or wars)?

Too many failed logins on Minecraft?

I keep on getting "Failed login" or "too many failed logins". I got Minecraft from my friend for free. My account works on Minecraft.net. How can I Fix it. I don't have Admin privileges and I have the Norton Family(if you know what that is). How can I fix it?

Is Herobrine real Minecraft?

So I love playing minecraft and I heard about herobrine and I did too much research on him and now I'm scared really scared whenever I turn on minecraft I get spooked and close it please help!

Trouble downloading Mincraft texture packs on Mac?

Whenever i try to download from ANY website it takes me to some page that trys to sell coupons "while you wait". Well i waited 3 hours one day and nothing happened, and it keeps saying "downloading". I'm also a computer newb BTW.