Games like O Monumento
Games like O Monumento include Blue Prince, The Painscreek Killings, Murders on the Yangtze River, The Witness, and Return of the Obra Dinn. We matched them by the tags players give O Monumento on Steam (Puzzle, Trivia, Investigation, Mystery, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Blue Prince
Shared: Puzzle · Mystery · Investigation

The Painscreek Killings
Shared: Investigation · Mystery · Puzzle

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

The Witness
Shared: Puzzle · Singleplayer · First-Person

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

Outer Wilds
Shared: Mystery · Puzzle · Exploration

Poppy Playtime
Shared: Puzzle · Singleplayer · First-Person

Riven
Shared: Puzzle · Singleplayer · First-Person

The House of Da Vinci
Shared: Puzzle · Mystery · Singleplayer

The Room 4: Old Sins
Shared: Puzzle · Mystery · Singleplayer

Quern - Undying Thoughts
Shared: Puzzle · Mystery · Singleplayer

The Room
Shared: Puzzle · Mystery · Singleplayer

Bendy and the Ink Machine
Shared: Puzzle · Singleplayer · First-Person

Strange Horticulture
Shared: Puzzle · Mystery · Investigation

Escape Simulator 2
Shared: Puzzle · Investigation · First-Person

The Talos Principle
Shared: Puzzle · First-Person · Singleplayer

The Roottrees are Dead
Shared: Puzzle · Mystery · Investigation

What Remains of Edith Finch
Shared: Mystery · First-Person · Singleplayer

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

Scene Investigators
Shared: Investigation · Puzzle · Mystery

Antichamber
Shared: Puzzle · First-Person · Singleplayer

Call of the Sea
Shared: Puzzle · First-Person · Mystery

The Séance of Blake Manor
Shared: Puzzle · Mystery · Singleplayer

Indiana Jones and the Great Circle
Shared: Puzzle · First-Person · Singleplayer