
Grow mould in three days
Drop ice cream, fruit or ketchup on the paper and tap Wait 3 days. Mould colonies bloom, the food dries and the flies arrive. No smell, no bin.
Game Tailors
Source: Rainy day activities for kids: 10 ideas, screen and kitchen
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For parents
Ten indoor ideas for children of about 4 to 10. Five are messy experiments you'd rather not do in your kitchen, so they happen on screen. Five are real ones for the kitchen table, with things from the cupboard. Each links to its own step-by-step page.


Drop ice cream, fruit or ketchup on the paper and tap Wait 3 days. Mould colonies bloom, the food dries and the flies arrive. No smell, no bin.

In the Science tab, set off cola and mints. A fountain shoots up and rains sticky brown drops all round. If the ants are out, they come for the sugar.

A fat, stripy snake of foam pushes out of the bottle and piles up on the paper, and the bottle's spot gets warm. The real version needs an adult; this one doesn't.

Dip the whole sheet in red cabbage juice, then paint with vinegar (pink) and dish soap or baking soda (blue to green). The colours follow the real cabbage chart.

Crayon a rainbow, paint dark paint over it, let it dry, then scratch a drawing through with a toothpick (in the full toolbox). The real one works with crayons and poster paint too.

Milk on a plate, a few drops of food colouring, then a cotton bud dipped in dish soap. The colours burst away and swirl. About ten minutes, hardly any mess.

A heap of baking soda in a tray, then vinegar with a drop of food colouring. It fizzes up into coloured foam. Do it in a tray and keep the vinegar away from eyes.

Draw with white glue, cover it with salt, shake off the rest and touch the lines with watercolour. The colour races along the salt. Let it dry flat overnight.

A dot of washable black felt-tip on a coffee filter, the tip of the paper in a little water, and the black slowly splits into other colours as the water climbs.

Cress seeds on damp kitchen paper or cotton wool, kept damp. The rain will have stopped long before you can snip it, but it sprouts within days, which makes a good thing to check each morning.
Mix a little screen time with real kitchen experiments: magic milk, a baking soda volcano, salt painting, finding the colours in a black pen and starting cress all use things most kitchens already have.
Magic milk and the black pen colours are the tidiest. Salt painting and the volcano need a tray. The messiest ones, like the cola geyser and mould, are the on-screen ones.
Magic milk, salt painting and starting cress work well with little ones, with you doing the pouring. On screen, everything on the list works for any age.
The mould, the cola geyser, elephant toothpaste and red cabbage paper are all in the free part. Scratch art needs the toothpick, which is in the full toolbox.