This expansion to Triqueta introduces a new type of animal: the friendly but shy wolves, who prefer to keep to the shadows. They step out from the shadows at the end of the game and are then worth a lot of points when forming a triqueta. However, since one of each other animal is also hiding in the shadows, collecting shadow animal tokens is never risk-free.
Hidden Wolves (designed by Stefan Dorra, Ralf zur Linde) adds 15 shadow animal tokens to the base game. As a special bonus, it comes with an exciting 2-player variant that makes the gameplay at that player count extremely enjoyable.