Babel is made up of two expansions, which may be played together or separately.
TOWER OF BABEL
The Babel tiles represent parts of the Tower which may be built during the game. There are 24 tiles in all, and they are all different from one another. Each tile built will influence all of the players with regards to commerce, war, science, and civil affairs.
The game plays out according to the rules in the basic game. However, the players may now discard their chosen card to take part in the construction of the Tower of Babel.
The Great Projects of Babel are prestigious buildings which players will attempt to construct. Each card has a color, a name, a participation cost (in the upper left corner), a penalty, and a reward. There are 15 in total, 5 for each Age.
From now on, when a player constructs a building of the same color as the Great Project card in play (Brown, Blue, Red, Yellow, Green, or Purple), that player has the option to participate in its construction. To do that, the player must pay the participation cost in addition to the cost of their building. In return, the player takes a Participation token which they place on their Wonder board.
For your first few games, we suggest you play only with the Tower of Babel expansion, then only with the Great Projects of Babel expansion. Make sure that each player has played each expansion separately before combining them. You will then be able to combine these expansions with Leaders, Cities and/or the Wonder Pack.
*NOTE: This is an Expansion. 7 Wonders is required to play.