Comment Re:No surprise (Score 1) 195
Virtually any game can be played in offline mode provided that 1) it has been launched with an active Internet application and 2) your Steam client is updated.
The login prompt should not appear for games that cannot be played offline--instead, you should receive the message "This Game Cannot Be Started in Offline Mode." What it sounds like is happening to you is that Steam is not running before you start a game. The option to launch Steam in offline mode only appears after login has failed.