Games like Black Square
Games like Black Square include Portal 2, LIMBO, Portal, Viewfinder, and Polarity. We matched them by the tags players give Black Square on Steam (Adventure, Strategy, Puzzle, Platformer, and Puzzle Platformer): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Puzzle · Platformer · Puzzle Platformer

LIMBO
Shared: Puzzle · Puzzle Platformer · Platformer

Portal
Shared: Puzzle · Puzzle Platformer · First-Person

Viewfinder
Shared: Puzzle · Puzzle Platformer · Adventure

Polarity
Shared: Puzzle · Adventure · Strategy

Little Nightmares
Shared: Adventure · Puzzle Platformer · Puzzle

Supraland
Shared: Adventure · Puzzle Platformer · Puzzle

BEEP
Shared: Adventure · Platformer · Puzzle

FEZ
Shared: Puzzle · Platformer · Adventure

The Pedestrian
Shared: Puzzle · Puzzle Platformer · Platformer

COCOON
Shared: Adventure · Puzzle · Puzzle Platformer

Human Fall Flat
Shared: Puzzle · Adventure · Puzzle Platformer

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

The Room
Shared: Puzzle · Adventure · Hidden Object

The Ball
Shared: Puzzle · Strategy · Puzzle Platformer

Poppy Playtime
Shared: Puzzle · First-Person · Adventure

Little Nightmares II
Shared: Adventure · Puzzle · Puzzle Platformer

The Room 4: Old Sins
Shared: Puzzle · Adventure · Hidden Object

Seen
Shared: Adventure · Puzzle · Platformer

PEAK
Shared: Adventure · First-Person · 3D

The Room Three
Shared: Adventure · Puzzle · Hidden Object

Q.U.B.E: Director's Cut
Shared: Puzzle · Adventure · First-Person

The Bridge
Shared: Puzzle Platformer · Puzzle · Strategy

FAR: Lone Sails
Shared: Adventure · Puzzle · Indie