Like other Blizzard games, Diablo 3 has received a free starter edition which allows players to play through act 1 and advance to level 13.
You can get the FREE Starter Edition in any of the following ways:
· Grab the Diablo III game disc from a friend, install the game, and then log in with your Battle.net account. The Diablo III Starter Edition will be added to your account automatically.
Note that certain game features are restricted on Starter Edition accounts. Any progress and achievements you earn while playing the Starter Edition will automatically carry over if you decide to upgrade to the full version of Diablo III, and the Starter Edition restrictions will be removed.