Games like SIZIF
Games like SIZIF include Sonic Adventure 2, ALTF4, SONIC X SHADOW GENERATIONS, Sonic Adventure DX, and Sonic Frontiers. We matched them by the tags players give SIZIF on Steam (Action, Platformer, Runner, Abstract, and Replay Value): closest matches first, and among equally close ones the better-known games.

Sonic Adventure 2
Shared: Action · Platformer · 3D Platformer

ALTF4
Shared: Runner · Action · 3D Platformer

SONIC X SHADOW GENERATIONS
Shared: Action · Platformer · 3D Platformer

Sonic Adventure DX
Shared: Platformer · Action · 3D Platformer

Sonic Frontiers
Shared: Action · 3D Platformer · Platformer

Pseudoregalia
Shared: 3D Platformer · Platformer · 3D

Spark the Electric Jester 3
Shared: Action · Platformer · 3D

Crash Bandicoot™ 4: It’s About Time
Shared: Action · Platformer · 3D Platformer

Haste
Shared: Action · Runner · 3D Platformer

Psychonauts
Shared: Platformer · Action · 3D Platformer

Pumpkin Jack
Shared: Action · 3D Platformer · Platformer

Neon White
Shared: Platformer · Action · 3D Platformer

Portal 2
Shared: Platformer · Action · 3D Platformer

Yellow Taxi Goes Vroom
Shared: Platformer · 3D · 3D Platformer

Last Train Outta' Wormtown
Shared: Action · Platformer · 3D Platformer

BlazBlue Entropy Effect
Shared: Action · Platformer · Replay Value

Tiny and Big: Grandpas Leftovers
Shared: Platformer · Action · 3D Platformer

FOTONICA
Shared: Action · Abstract · Runner

Boson X
Shared: Action · Runner · Platformer

Marble It Up! Ultra
Shared: Platformer · 3D Platformer · Action

Warhammer 40,000: Space Marine 2
Shared: Action · Third Person · 3D

Phantom Abyss
Shared: Action · Platformer · 3D Platformer

Defy Gravity Extended
Shared: Platformer · Action · Indie

Rogue Legacy 2
Shared: Platformer · Action · Indie