Open spaces
But there is one possibility that few seem to have done anything about and I am surprised that creative thinkers have done so little about this. Nearly every block of flat has a flat roof and, if the parents in that block got together and spent a bit of money, it could be turned into a very good play area. Such areas, with necessary permissions, could be roofed in and have metal grills to provide space for volleyball or even basketball, cricket practice nets, handball (a very Bangladesh-friendly sport with its own league) or just for happy rushing around and riding small bicycles. Those who build such flats must avoid putting unnecessary things on the roof and the wise landlord should inform his architect of his plans to make his flats especially desirable for parents.
However, I fear there are some parents who, however much space you give them, will not approve of their child's playing nor make time to promote or share it. I know of some children who only play in their own small backyard and not in the public field opposite, because "It is full of bad people." Oh, dear!