Výsadek is an organizer of a recurring mystery adventure in which participants discover the destination as the event unfolds. The website lists editions dating from 1997 through 2020, including separate spring and autumn events in 2005. Rather than revealing the route or finish in advance, the organizers keep details secret to preserve the challenge and enjoyment.

Participants meet at a designated starting point, receive an introduction, and are then transported to an undisclosed location. Along the way, they complete tasks and collect clues, using each step to work out where the adventure ends. The site supports the event with practical information, including dates and what to bring, as well as a registration form and a list of registered participants.

It also provides results and a description of the latest edition, photo galleries, and contact details. Výsadek’s offering is therefore a carefully concealed, task-based group adventure, complemented by the information and resources participants need to sign up, prepare, and look back on past events