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Make up the jelly following pack instructions. Pour a third of the mixture into 12 small glasses or plastic pots. Add a couple of bugs to each pot, then leave to set in the fridge, keeping remaining jelly at room temperature.
Once set, add more bugs to each container (lean some against edges, so they stick out the top). Pour over a third of the jelly and leave to set in the fridge. Repeat with remaining bugs and jelly.
For the soil topping, place cookies in a plastic bag and, using a rolling pin, bash into crumbs, then tip onto a plate.
Just before serving, sprinkle a layer of soil over each set jelly, then top with a mushroom, a slug and some ants or your choice of creepy crawlies.