You can buy your ticket online for Germany, France, Belgium, Austria, the Netherlands, London and Denmark. The special offers "Centre Pompidou-Metz" and Walygator (seasonal) can also be bought online.
Click here for France.
Click here for the "Centre Pompidou-Metz" offer.
Click here for all other countries.
On the day you travel, during the ticket inspection, you only have to show your printed ticket together with your ID.