esc key then select options
go to options, and force update. this will restore your minecraft jar and make it run again.
Enter no password, and the options will appear of 'play offline' or 'try again'. Select play offline.
Increase the sensitivity bar in the options menu.
you cant without some crazy mod
Did you buy minecraft? If you did, then keep logging in. After logging in AT LEAST ONCE, the not downloaded text will never appear, and you can press "play offline!". But if you accidentally delete minecraft off of your computer, you have to log in again.
Minecraft is not available on Nintendo 3DS, and there are no plans for it to ever appear on the platform.
Peaceful mode is still in Minecraft. To activate it, select Options in the pause menu and change the Difficulty to Peaceful. Monsters don't appear in Peaceful mode. You can't use Peaceful difficulty if your world is in Hardcore mode.
You can some-what make texture packs by using the Painterly Pack, which has a bunch of pre-made options, and you can choose different textures for different items.
Options > Open to LAN
Go into options
Infdev
when you open minecraft to log on you click the more options and click force update.