One of the premier bouldering walls in Europe, B2 will stretch your limits like no other wall. Built on two levels, it has several hundred problems, all graded, suitable for all levels and regularly changed. There are even a few fun competitions each year. It is also has a pleasant social atmosphere, with a bar and small garden outside. Be careful though, although the padding rises as the problems get higher, and so can be enjoyed in complete safety, muscle and tendon injuries are common. Warm up thoroughly, try things well within your ability, especially if you are not used to bouldering, and try to ignore the regulars who can climb overhanging walls, without holds, with consumate ease.