Games like Hill Agency: PURITYdecay
Games like Hill Agency: PURITYdecay include L.A. Noire, Mirror 2: Project X, No Case Should Remain Unsolved, Her Story, and Contradiction: Spot The Liar. We matched them by the tags players give Hill Agency: PURITYdecay on Steam (Adventure, Interactive Fiction, Investigation, Side Scroller, and 3D): closest matches first, and among equally close ones the better-known games.

L.A. Noire
Shared: Adventure · Noir · Investigation

Mirror 2: Project X
Shared: 3D · Interactive Fiction · Female Protagonist

No Case Should Remain Unsolved
Shared: Investigation · Interactive Fiction · Adventure

Her Story
Shared: Investigation · Interactive Fiction · Adventure

Contradiction: Spot The Liar
Shared: Investigation · Interactive Fiction · Crime

Nobody Wants to Die
Shared: 3D · Noir · Interactive Fiction

Sherlock Holmes: Crimes and Punishments
Shared: Adventure · Investigation · Detective

The Mermaid Mask
Shared: Adventure · Interactive Fiction · Investigation

Duck Detective: The Secret Salami
Shared: Investigation · Adventure · Noir

AI: THE SOMNIUM FILES - nirvanA Initiative
Shared: Adventure · Investigation · Noir

Pentiment
Shared: Adventure · Investigation · Interactive Fiction

ICEY
Shared: Adventure · Side Scroller · Female Protagonist

Sherlock Holmes: The Devil's Daughter
Shared: Adventure · Detective · Crime

A Plague Tale: Requiem
Shared: Adventure · Interactive Fiction · Female Protagonist

The Roottrees are Dead
Shared: Investigation · Adventure · Detective

This Bed We Made
Shared: Investigation · Female Protagonist · Noir

Kathy Rain 2: Soothsayer
Shared: Investigation · Atmospheric · Interactive Fiction

Chants of Sennaar
Shared: Adventure · Atmospheric · Stylized

Contrast
Shared: Adventure · Female Protagonist · Noir

The Operator
Shared: Investigation · Atmospheric · Detective

Duck Detective: The Ghost of Glamping
Shared: Adventure · Investigation · Noir

COCOON
Shared: Adventure · 3D · Stylized

The Rise of the Golden Idol
Shared: Investigation · Adventure · Detective

Lacuna A Sci-Fi Noir Adventure
Shared: Interactive Fiction · Noir · Adventure