Ah, the metro—rush hours, delays, forgotten luggage, heat, "traffic regulation," and disruptions. A central element of daily life for any self-respecting Parisian, the metro and RER (Réseau Express Régional) often seem to play tricks on commuters. While these issues can be frustrating, they now offer a new twist: a game that turns the unpredictability of public transport into a fun challenge. Enter Tournik, a free game that transforms disruptions in the Île-de-France transport network into daily predictions. Every day, players are presented with nine challenges: six related to the metro and three to the RER. The goal is to guess which incidents might occur the next day and place virtual bets on them. If you're familiar with the lines and their common issues, it might not be too hard to win points. The game uses 1,000 virtual tickets per player, which can be distributed among the different challenges. The odds are determined based on the frequency of past incidents over the last 12 months. After placing bets, players wait for the results, which are analyzed overnight. Winners earn points that help them climb the general ranking. New challenges are generated each morning at 5 a.m., keeping the game fresh and dynamic. Tournik turns the annoyances of public transport into opportunities for engagement and learning. Frequent incidents, such as outages or signaling problems, can make certain predictions more interesting. While you won’t win real money—everything is virtual—the game allows players to become more aware of the patterns and challenges of the transport network. In the end, if your line is disrupted tomorrow, you can at least say you saw it coming.