Abstract: A multiplicity of rectangular base blocks or toppling member carriers are drilled to form aligned bores for the reception of a flexible pull cord and are spaced apart from each other by ovoid bead-like spacers. Mounted on each base block or toppling member carrier transversely to the cord bore is the lower leaf of a hinge, the upper leaf of which carries a channel clip member having a recess adapted to grip and hold the lower end of a toppling member, such as a domino. In operation, when a leading toppling member is pushed backward it topples backward and consequently causes the trailing toppling members to topple backward in succession. The toppling members are reset into their upright positions by passing a finger forwardly along their side edges.