Games like The Hardest Game Ever
Games like The Hardest Game Ever include Celeste, Geometry Dash, Hollow Knight, Hollow Knight: Silksong, and Super Meat Boy. We matched them by the tags players give The Hardest Game Ever on Steam (Difficult, Precision Platformer, Adventure, 2D, and Parkour): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Difficult · Precision Platformer · Platformer

Geometry Dash
Shared: Difficult · 2D · Precision Platformer

Hollow Knight
Shared: Difficult · 2D · Platformer

Hollow Knight: Silksong
Shared: Difficult · 2D · Singleplayer

Super Meat Boy
Shared: Precision Platformer · Difficult · Platformer

Jump King
Shared: Difficult · Precision Platformer · Adventure

The End Is Nigh
Shared: Precision Platformer · Difficult · Adventure

Rain World
Shared: Difficult · 2D · Platformer

Cuphead
Shared: Difficult · 2D · Platformer

Neon Beats
Shared: Free to Play · 2D · Precision Platformer

VVVVVV
Shared: Precision Platformer · Difficult · Platformer

Changed
Shared: Difficult · Cute · Adventure

Nine Sols
Shared: Difficult · 2D · Platformer

SANABI
Shared: Adventure · 2D · Singleplayer

LIMBO
Shared: 2D · Adventure · Platformer

Shovel Knight: Treasure Trove
Shared: Platformer · 2D · Adventure

A Difficult Game About Climbing
Shared: Difficult · Adventure · Precision Platformer

BEEP
Shared: Adventure · 2D · Platformer

Wings of Vi
Shared: Difficult · Precision Platformer · 2D

Ori and the Will of the Wisps
Shared: Adventure · Singleplayer · Platformer

Skul: The Hero Slayer
Shared: 2D · Indie · Difficult

Pogostuck: Rage With Your Friends
Shared: Difficult · Precision Platformer · Adventure

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

Downwell
Shared: Precision Platformer · Difficult · Platformer