Games like Altero
Games like Altero include LIMBO, The Pedestrian, Planet of Lana, Celeste, and INSIDE. We matched them by the tags players give Altero on Steam (Puzzle Platformer, Side Scroller, Precision Platformer, Puzzle, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

LIMBO
Shared: Puzzle Platformer · Puzzle · Platformer

The Pedestrian
Shared: Puzzle Platformer · Puzzle · Side Scroller

Planet of Lana
Shared: Puzzle Platformer · 2D Platformer · Puzzle

Celeste
Shared: Precision Platformer · Platformer · 2D Platformer

INSIDE
Shared: Puzzle Platformer · 2.5D · Puzzle

Thomas Was Alone
Shared: Side Scroller · Puzzle Platformer · Platformer

Leap Year
Shared: Precision Platformer · Puzzle Platformer · 2D Platformer

Braid
Shared: Puzzle Platformer · Puzzle · 2D Platformer

Super Meat Boy
Shared: Precision Platformer · Platformer · 2D Platformer

Max: The Curse of Brotherhood
Shared: Puzzle Platformer · Puzzle · Platformer

Neva
Shared: Platformer · Puzzle · 2D Platformer

Trine 2: Complete Story
Shared: Puzzle Platformer · 2D Platformer · Platformer

Öoo
Shared: Puzzle Platformer · Puzzle · 2D Platformer

Mind Over Magnet
Shared: Puzzle Platformer · Puzzle · 2D Platformer

Oddworld: New 'n' Tasty
Shared: Puzzle Platformer · Platformer · Puzzle

Creepy Tale
Shared: Puzzle Platformer · Puzzle · 2D Platformer

FAR: Changing Tides
Shared: Puzzle Platformer · 2.5D · Platformer

Seen
Shared: Puzzle · Puzzle Platformer · Platformer

ANIMAL WELL
Shared: Puzzle Platformer · Puzzle · Platformer

Webbed
Shared: Puzzle Platformer · 2D Platformer · 2D

Portal 2
Shared: Puzzle · Platformer · Puzzle Platformer

Mark of the Ninja
Shared: Platformer · Side Scroller · 2D

Deadlight
Shared: Platformer · Side Scroller · Action

SANABI
Shared: 2D Platformer · Action · 2D

