Games like Attempt[42]
Games like Attempt[42] include Portal, Portal 2, Refunct, Viewfinder, and A Story About My Uncle. We matched them by the tags players give Attempt[42] on Steam (3D Platformer, First-Person, Puzzle, Casual, and Indie): closest matches first, and among equally close ones the better-known games.

Portal
Shared: Puzzle · First-Person · 3D Platformer

Portal 2
Shared: Puzzle · First-Person · 3D Platformer

Refunct
Shared: 3D Platformer · First-Person · Casual

Viewfinder
Shared: First-Person · Puzzle · Puzzle Platformer

A Story About My Uncle
Shared: First-Person · Indie · 3D Platformer

EDGE
Shared: Puzzle · Indie · Puzzle Platformer

Hook
Shared: Puzzle · Casual · Abstract

Antichamber
Shared: First-Person · Puzzle · Indie

Zup! S
Shared: Puzzle · Casual · Indie

LIMBO
Shared: Puzzle · Indie · Puzzle Platformer

Moncage
Shared: Puzzle · Casual · Indie

The Witness
Shared: Puzzle · First-Person · Indie

Zup!
Shared: Puzzle · Casual · Indie

Manifold Garden
Shared: Puzzle · First-Person · Abstract

Zup! 2
Shared: Puzzle · Casual · Indie

SUPERHOT
Shared: Action · First-Person · Indie

Monument Valley 3
Shared: Casual · Puzzle · Relaxing

Defy Gravity Extended
Shared: Puzzle · Indie · Puzzle Platformer

LYNE
Shared: Puzzle · Casual · Relaxing

klocki
Shared: Puzzle · Casual · Relaxing

Clustertruck
Shared: First-Person · 3D Platformer · Action

Zup! 3
Shared: Puzzle · Casual · Indie

Hexcells
Shared: Puzzle · Casual · Indie

Zup! F
Shared: Puzzle · Casual · Indie