Abstract: A manipulative puzzle is disclosed in which a succession of coaxial wheel-like elements is to be moved by a projective pattern to selectively exclude ones of these elements from a lot to be rotated in relation to the others. An embodiment has a disassembled configuration in which the various self-integrating parts comprise a semi-tubular limiter adapted for educational use in the assembly of a compact annular body from initially isolated elements, and an actuative projectional unit. The equable arbor able to provided by this limiter and the range of moves able to be performed unite conceptually the broad style of its puzzle with simpler apparatuses made to challenge a toddler. In addition this actuative projectional unit is selectively installable to determine the complexity of its puzzle.