Games like GRUNND
Games like GRUNND include The Case of the Golden Idol, No Case Should Remain Unsolved, The Mermaid Mask, The Roottrees are Dead, and Strange Horticulture. We matched them by the tags players give GRUNND on Steam (Mystery, Interactive Fiction, Puzzle, Detective, and Point & Click): closest matches first, and among equally close ones the better-known games.

The Case of the Golden Idol
Shared: Mystery · Detective · Puzzle

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

The Mermaid Mask
Shared: Detective · Puzzle · Interactive Fiction

The Roottrees are Dead
Shared: Mystery · Puzzle · Detective

Strange Horticulture
Shared: Mystery · Puzzle · Detective

Tangle Tower
Shared: Detective · Puzzle · Point & Click

Phoenix Wright: Ace Attorney Trilogy
Shared: Mystery · Detective · Visual Novel

Cyber Manhunt 2: New World - The Hacking Simulator
Shared: Mystery · Puzzle · Detective

Murders on the Yangtze River
Shared: Puzzle · Detective · Mystery

The Operator
Shared: Detective · Puzzle · Investigation

Return of the Obra Dinn
Shared: Mystery · Detective · Puzzle

Duck Detective: The Secret Salami
Shared: Detective · Investigation · Mystery

Sherlock Holmes: Crimes and Punishments
Shared: Mystery · Detective · Puzzle

Danganronpa: Trigger Happy Havoc
Shared: Mystery · Detective · Visual Novel

Tails Noir
Shared: Detective · Interactive Fiction · Visual Novel

Her Story
Shared: Interactive Fiction · Investigation · Detective

Unheard - Voices of Crime
Shared: Mystery · Detective · Puzzle

Sanfu
Shared: Mystery · Puzzle · Visual Novel

Sherlock Holmes: The Devil's Daughter
Shared: Mystery · Detective · Puzzle

L.A. Noire
Shared: Detective · Mystery · Noir

Kathy Rain 2: Soothsayer
Shared: Mystery · Investigation · Point & Click

Cube Escape Collection
Shared: Mystery · Puzzle · Point & Click

Trials of Innocence
Shared: Interactive Fiction · Detective · Mystery

The White Door
Shared: Puzzle · Mystery · Detective