Boardgamegeek
The tower is the fourth major expansion for the carcassonne game. tower segments are added to the game, as well as some new actions. instead of placing a meeple as usual on their turns, players can now either place a tower segment on a tile with a space for a tower, add a tower segment to a tower already standing, or place a meeple on top of a tower (which "finishes" it).
placing a tower segment allows you to capture other players' meeples, so long as they are in view of the tower in an orthogonal direction. if the tower is 1 piece high, they can capture meeples that are within 1 tile of the tower; if the tower is 2 pieces high, they can capture meeples within 2 tiles of the tower; etc. not only do players lose whatever they may have scored with that meeple, but they also have to pay 3 victory points if they want to free their meeple.
part of the carcassonne series.
http://www.boardgamegeek.com/game/21385
Carcassonne.nl
Carcassonne.nl
http://www.carcassonne.nl/spel_toren.html