Toy building set comprising at least one assembly having a surface several coupling studs is provided. The coupling studs extending from the surface, and a pattern where there is a distance which is mutually fixed between committed coupling studs next. Toy building set further comprises a perforator, with piercing holes instrument a housing, in the housing, wherein the perforator is, for example, to be able pierce the sheet such as paper, thin like the sheet material At least one piercer pierce the material from the configured sheet part is composed of said orifice comprises one or spread, such as can be introduced more binding studs in a hole drilled above. Assembly wherein the housing comprises an essentially flat surface, wherein the planar surface is provided with a recess to form several coupling means, said coupling means are complementary to the coupling studs, the is composed of a distance said fixed to the same mutually the spacing of the coupling studs of assembly, therefore it is possible to attach the housing to the assembly.
.FIELD 1