Pay the number of ore necessary to reach the next level of the tower. (For example, the 1st level costs 1 ore, the 2nd level costs 2 ore, and so forth.) Advance your tower token up by one level. You may only build one tower level per action. Tower tokens should be placed in the middle column of the card as they advance. At the end of the game, you’ll gain VP equal to that listed on your tower level.