Last week I found the above 'device' in the church at Camporgiano. It comprises of a list of intentions, numbered 1 to 90, which relate to the Holy Souls in Purgatory. So, for example no. 8 would be 'for those souls who were devoted to the Seraphic St Francis', no.10 'for the souls of your father and mother' and no. 52 'for the souls of those Religious who were unfaithful to their vows.'
Attached to the board is a tray containing wooden balls with numbers on them - rather like bingo. The aim is to pick up a ball, consult the number on the chart and pray for that intention for following week or month. It seems a good idea, which children in particular would like, and could be expanded to include other intentions.