Games like Subject A-119
Games like Subject A-119 include The Talos Principle, Big Walk, A Story About My Uncle, Portal, and The Turing Test. We matched them by the tags players give Subject A-119 on Steam (Casual, Adventure, Puzzle, Sci-fi, and Magic): closest matches first, and among equally close ones the better-known games.

The Talos Principle
Shared: Puzzle · Sci-fi · First-Person

Big Walk
Shared: Puzzle · Adventure · Casual

A Story About My Uncle
Shared: Adventure · First-Person · Puzzle

Portal
Shared: Puzzle · First-Person · Sci-fi

The Turing Test
Shared: Puzzle · Sci-fi · Adventure

Portal 2
Shared: Puzzle · First-Person · Adventure

Escape Simulator
Shared: Puzzle · Adventure · First-Person

The Room
Shared: Puzzle · Adventure · Casual

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

Machinika: Atlas
Shared: Casual · Adventure · Puzzle

Atomic Heart
Shared: Adventure · Puzzle · Sci-fi

The Talos Principle 2
Shared: Puzzle · Sci-fi · First-Person

Scribblenauts Unlimited
Shared: Casual · Puzzle · Adventure

Moncage
Shared: Casual · Puzzle · Adventure

Little Witch in the Woods
Shared: Casual · Magic · Puzzle

The Entropy Centre
Shared: Puzzle · Sci-fi · First-Person

Pikuniku
Shared: Adventure · Casual · Puzzle

VLADiK BRUTAL
Shared: Adventure · First-Person · Casual

We Were Here Expeditions: The FriendShip
Shared: Puzzle · Adventure · Casual

Half-Life 2
Shared: Sci-fi · Adventure · First-Person

There Is No Game: Wrong Dimension
Shared: Puzzle · Adventure · Casual

Polarity
Shared: Puzzle · Adventure · First-Person

Strange Jigsaws
Shared: Casual · Adventure · Puzzle

Monument Valley
Shared: Puzzle · Adventure · Casual