I will tell u how to download a craked version of minecraft, which u can play singleplayer and multiplayer and I will teach u how:)
1. go to google and search “utorrent”, go to the first result and download and install utorrent.(u will also need winrar)
2. now go to btjunkie.com/search and search for minecraft
3. go to the first result and it should be beta and auto update.
4.download it and it would just take 2-5 seconds since it is only about 600kb.
extract the file to anywhere that is handy.
5. disconnect from the internet to play singleplayer and if u or ur friends are running multi server ask them to change online-mode to false, or if its ur server do it yourself.
6. now play like a normal person, u dont even need any account just a random username