Find objects that fit a specific category or criteria

I've decided that i want to do Breast Cancer . In this game i want hidden objects that are related to the topic so the player will have time to give the Breast Cancer Innocent time to save their life . If they run out of time the innocent passes away . What i'm trying to say is that they die and they can try again . I Want to do this topic because the player can play something they want and it's challenging at the same time . That's my game topic for now .