

In original D2 you could by using the included LAN functionality (TCP/IP) but this was unfortunately removed from D2R before launch. Offline is local single player (SP for short) where you can’t play with other players. These features are Terror Zones (available to both non-ladder and ladder) and sunder charms (ladder only). Online also currently has exclusive content that offline currently doesn’t have. Ladder is a competition to be the first to reach level 99 (most play it for a fresh trading economy rather than the race though) and is slated to last 4 months in D2R after which it will reset. Online allows you to play with other people and has two distinct modes, non-ladder and ladder.
