Games like Sixth Grade Detective
Games like Sixth Grade Detective include Roadwarden, The Life and Suffering of Sir Brante, Choice of Robots, Suzerain, and The Life and Suffering of Sir Brante — Chapter 1&2. We matched them by the tags players give Sixth Grade Detective on Steam (RPG, Indie, Text-Based, Choose Your Own Adventure, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Roadwarden
Shared: RPG · Text-Based · Indie

The Life and Suffering of Sir Brante
Shared: RPG · Choose Your Own Adventure · Interactive Fiction

Choice of Robots
Shared: Text-Based · Choose Your Own Adventure · Indie

Suzerain
Shared: Choose Your Own Adventure · Interactive Fiction · Text-Based

The Life and Suffering of Sir Brante — Chapter 1&2
Shared: Choose Your Own Adventure · Interactive Fiction · RPG

Sorcery! Parts 1 and 2
Shared: RPG · Choose Your Own Adventure · Indie

Heroes Rise: The Prodigy
Shared: RPG · Text-Based · Indie

Fallen Hero: Rebirth
Shared: Indie · Text-Based · RPG

Choice of the Deathless
Shared: RPG · Text-Based · Choose Your Own Adventure

Wayhaven Chronicles: Book One
Shared: RPG · Indie · Text-Based

Aliya: Timelink
Shared: RPG · Interactive Fiction · Text-Based

Tin Star
Shared: RPG · Indie · Choose Your Own Adventure

Citizen Sleeper
Shared: RPG · Interactive Fiction · Text-Based

Vampire: The Masquerade — Night Road
Shared: Text-Based · Choose Your Own Adventure · RPG

Community College Hero: Trial by Fire
Shared: RPG · Indie · Text-Based

Vampire: The Masquerade — Parliament of Knives
Shared: RPG · Indie · Text-Based

To the Moon
Shared: Indie · RPG · Interactive Fiction

Zombie Exodus: Safe Haven
Shared: RPG · Indie · Text-Based

Breakout 13
Shared: Choose Your Own Adventure · Interactive Fiction · RPG

Fabled Lands
Shared: RPG · Choose Your Own Adventure · Interactive Fiction

Zombie Exodus
Shared: RPG · Text-Based · Indie

VERSUS: The Lost Ones
Shared: RPG · Indie · Text-Based

Heroes Rise: The Hero Project
Shared: RPG · Indie · Text-Based

MetaHuman Inc.
Shared: RPG · Indie · Text-Based