* State of grace at least when performing the indulgenced act
* Complete detachment from sin, even venial sin
* Confession (20 days before or after the indulgenced act)
* Communion (20 days before or after the indulgenced act)
* Prayers for the Supreme Pontiff (20 days before or after the indulgenced act)
*Indulgenced act: a special good work with special conditions of place and time
Indulgenced acts to be performed for obtaining a Plenary Indulgence for the Poor Souls of Purgatory:
From November 1 to 8: visit a cemetery with mental prayer for the poor souls.
On November 2: visit a church or an oratory with one Our Father and one Creed being recited.