Professor Pünschge is wandering home from his laboratory, and it's up to the players to find out the path he is using. The game includes both a cooperative and a competitive variant.
The board depicts a numbered path from the lab to the house. Each space on the path has several characteristics, like color, weather, terrain, or various icons. Each turn, one player picks up a route card and marks the first two spaces of the professor's path on the board. The other players then try to deduce the next spaces of the given route, in correct order. For each wrong answer, the active player gets a point. The other players get points only by solving the route.
There are 702 different routes in the deck. The routes vary from simple like "every even space" or "all spaces with three icons" to complex like "all forests without owls or clouds" or "green spaces on the upper half of the game board".