Abstract: A manual manipulation toy includes a circular platform having a plurality of upstanding spaced apart pins thereon adapted to engage and interrupt the progress of a rolling ball which is released at an upper level on the surface of the platform to roll towards a lower level while the platform is manually rotated in either direction to move the pins into engagement with the rolling ball thereby to retain the ball on the surface as long as possible. The platform is supported for rotation about an inclined, upstanding central axis and means is provided for selectively adjusting the angle of inclination and for counting the number of revolutions of the platform between the time when the ball is first released and subsequently rolls off an edge of the surface into a peripheral trough.