Games like Under The Red Sky
Games like Under The Red Sky include Haste, Neon White, Clustertruck, VHOLUME, and Sonic Adventure 2. We matched them by the tags players give Under The Red Sky on Steam (3D Platformer, Parkour, Fast-Paced, Platformer, and Runner): closest matches first, and among equally close ones the better-known games.

Haste
Shared: Parkour · Fast-Paced · 3D Platformer

Neon White
Shared: 3D Platformer · Fast-Paced · Parkour

Clustertruck
Shared: Parkour · 3D Platformer · Fast-Paced

VHOLUME
Shared: Parkour · 3D Platformer · Runner

Sonic Adventure 2
Shared: 3D Platformer · Platformer · Fast-Paced

Sonic Frontiers
Shared: 3D Platformer · Fast-Paced · Action

Pseudoregalia
Shared: 3D Platformer · Parkour · Platformer

SEUM: Speedrunners from Hell
Shared: 3D Platformer · Parkour · Platformer

Mirror's Edge™ Catalyst
Shared: Parkour · 3D Platformer · Runner

Sonic Adventure DX
Shared: 3D Platformer · Platformer · Fast-Paced

SONIC X SHADOW GENERATIONS
Shared: 3D Platformer · Fast-Paced · Platformer

Cyber Hook
Shared: 3D Platformer · Parkour · Fast-Paced

Gorilla Tag
Shared: Parkour · 3D Platformer · First-Person

A Story About My Uncle
Shared: Parkour · 3D Platformer · Platformer

Mirror's Edge™
Shared: Parkour · 3D Platformer · Platformer

SpeedRunners
Shared: Fast-Paced · Platformer · Multiplayer

Sonic Lost World
Shared: 3D Platformer · Platformer · Parkour

Hot Lava
Shared: Parkour · 3D Platformer · Platformer

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

Refunct
Shared: 3D Platformer · Parkour · Platformer

Hover
Shared: Parkour · 3D Platformer · Action

Bloodthief
Shared: Parkour · Fast-Paced · 3D Platformer

Boson X
Shared: Parkour · Runner · Action

ALTF4
Shared: 3D Platformer · Runner · Platformer