Forgotten Hill: Mementos is a series of side adventure game set in the Forgotten Hill series, with the events depicted taking place prior to Forgotten Hill: Fall, serving as direct prequels and providing back stories to the series' antagonists.
The series consists of four games:
- Run Run Little Horse, featuring Nathan McMillan
- Love Beyond, featuring Ruth Norwood
- Buried Things
- Playground, featuring Theodore Ostergard