Hide a set of household objects with varying weights in identical bags, then feel each one by hand -- blindfolded or with eyes closed -- and try to order them from lightest to heaviest using judgment alone. Reveal and check the true order with a kitchen scale at the end.

What you need

6-8 household objects of varying weight
identical small bags
a kitchen scale (optional)

How to do it

1Hide each object in an identical bag so the shape and size can't give away the weight.
2Blindfolded or eyes closed, pick up each bag and place it in a line from what feels lightest to heaviest.
3Once the whole line is ordered, check the true order with a kitchen scale if one's available.
4Try again with a fresh set of objects to see if accuracy improves with practice.

Variations

If a kitchen scale isn't available: simply comparing bags two at a time by hand ('which is heavier?') still checks the ordering.
How it ends: comparing the guessed order to the true order and counting how many were placed correctly gives a clear score.

💡 Parent tip

Include two objects that are deceptively similar in weight but different in size -- the moment they realise size doesn't equal weight is often the best part of the game.

What your child develops

Weight discrimination — judging mass by feel alone is a genuinely demanding sensory-motor task
Comparative reasoning — ordering multiple items relative to each other rather than judging in isolation
Self-assessment — checking guesses against a real measurement builds honest self-evaluation