This ia a simple matching game for young children.
Print each base and the matching shape. Put the bases inside an opaque bag. Put the shape pieces inside another opaque bag. Each turn the person closes their eyes and picks a base. Look at the base shape. Close eyes again and try to find the matching shape only by sense of touch. No peeking. If the pices and base match, that is a point.
The game is really simple with only 4 shapes. Consider printing out the bases and shapes in several sizes - small, medium and large.