Games like Detective 26
Games like Detective 26 include Clue/Cluedo: Classic Edition, Dorfromantik, Wingspan, Just Go, and Armello. We matched them by the tags players give Detective 26 on Steam (Detective, Investigation, Strategy, Board Game, and 3D): closest matches first, and among equally close ones the better-known games.

Clue/Cluedo: Classic Edition
Shared: Board Game · Strategy · Detective

Dorfromantik
Shared: Board Game · Strategy · Turn-Based Strategy

Wingspan
Shared: Board Game · Strategy · Tabletop

Just Go
Shared: Strategy · Board Game · Turn-Based Strategy

Armello
Shared: Board Game · Strategy · Turn-Based Strategy

Root
Shared: Board Game · Strategy · Tabletop

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

Gremlins, Inc.
Shared: Board Game · Strategy · Tabletop

Talisman: Digital Classic Edition
Shared: Board Game · Strategy · Tabletop

Chess Ultra
Shared: Strategy · Board Game · Tabletop

Carcassonne - Tiles and Tactics
Shared: Strategy · Board Game · Tabletop

The Roottrees are Dead
Shared: Detective · Investigation · Mystery

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

Gomoku Let's Go
Shared: Strategy · 3D · Board Game

UNO
Shared: Board Game · Tabletop · Strategy

Bloons TD 6
Shared: Strategy · Singleplayer · 3D

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

Through the Ages
Shared: Strategy · Board Game · Tabletop

The Painscreek Killings
Shared: Investigation · Detective · Mystery

Blue Prince
Shared: Investigation · Mystery · Singleplayer

Rento Fortune: Online Dice Board Game (大富翁)
Shared: Board Game · Strategy · Tabletop

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

Terraforming Mars
Shared: Strategy · Board Game · Tabletop

Strange Horticulture
Shared: Detective · Mystery · Investigation