Re the 'natural' method of slug control i.e. by hand, this also is a
good game for young children. Mine (8 and 10 years, boys) delight
in crushing the snails underfoot which (snails) are then eaten by
the dog (Black Labrador) removing the mess on the driveway.
Unfortuneately neither dog nor children are keen on the slugs which
occur in about equal numbers.
Alternatively considering the hassles of maintaining both children
and a large dog in the garden, Sluggo might be a better choice.