As with just about every board game I have ever encountered, the instructions are quite difficult to get your head around. Usually, the best way is to start playing a trial game with instructions close at hand and work it out as you go.
Indigo is for 2-4 players aged 8+. The idea of the game is fairly simple: to collect gems using route tiles to move them across the board towards your gateway. However, the route tiles create intricate pathways along which the gems are moved. The player with the highest value of gems at the end of the game is the winner. It is a game of tactics with the potential for collaborative play in the best interests of more than one player.