When the kid is able to sit independently in comfort and use their hands in unison to open and close the drawer, this toy can be introduced.
If the child finds opening the drawer a bit difficult just introduce the first lid without the drawer.
Make sure that this arrangement is age-appropriate to prevent the child from feeling overburdened.
Stage 1: Offer the lid with only the circle and offer only the sphere in a small tray or bowl.
Stage 1.1: Offer the cylinder along the cube
Stage 2: Offer the lid with the square and cube.
Stage 2.1: Offer the cuboid once the child is comfortable with the cube
Stage 3: Offer the lid with the triangle and the triangular prism
Stage 4: Offer the lid with all shapes and elements
Stage 5: Offer a few coins with coin slot lid
Use only the solids later for a name lesson when the child is around 18M+
Put all the solids in a bag and encourage the child to feel and pick a solid.
Make the outlines of sides of the solids and the child can match them

Intentional Hand Release: Builds fine motor control and independence.

Hand-Eye Coordination: Improves precision and dexterity.

Cause & Effect Learning: Develops logic and problem-solving skills.

Spatial Awareness: Strengthens understanding of space and positioning.