From a training in the mountains, climbing has become a sport in its own right with its codes, its places, its culture. The block is a climbing practice without constraint of equipment, on walls 4.5m high, without rope with thick carpet on the ground for reception. It is a safe sport, accessible to all, adults and children from 3 years except for Didot and La Rochelle (12 years), Issy, Lille, Toulouse and Pantin Voie (4 years). The difficulty is crescendo thanks to the color codes of the courses like the ski slopes (green/ blue/ red). Scotch marks the starting shots. No speed objective, the aim of the game is to reach the highest shot while remaining in its color. White plugs are there to de-escalate blocks and fall from lower. Slippers are mandatory, available at the reception. Liquid magnesia helps to have a better grip on the plugs.