Ysabel

Ysabel is a free web-based strategy online game. Take the lead of your castle, improve economy, army and fight against enemies.

Unlike other games that never ends, Ysabel is divided is divided into rounds (~4 months long). At the end of each round the alliance that manages to save princess Ysabel is declared winner - that is basically the goal of the game.

Was built in such a way that is not killing your time. You can't build a high number of castles, number of buildings/upgrades are relatively small, number of attacks is also limited.

Forum and chat integrated help maintaining a great community; there are users there that played all the rounds - 8 so far.