Games like Sisyphos
Games like Sisyphos include Hollow Knight, Hollow Knight: Silksong, Geometry Dash, Rain World, and Getting Over It with Bennett Foddy. We matched them by the tags players give Sisyphos on Steam (Simulation, Casual, Physics, Difficult, and Side Scroller): closest matches first, and among equally close ones the better-known games.

Hollow Knight
Shared: Difficult · Platformer · 2D

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

Geometry Dash
Shared: Difficult · 2D · Platformer

Rain World
Shared: Difficult · Exploration · Platformer

Getting Over It with Bennett Foddy
Shared: Difficult · Physics · Platformer

Game Dev Tycoon
Shared: Simulation · Casual · Indie

LIMBO
Shared: Platformer · Indie · 2D

People Playground
Shared: Physics · Simulation · 2D

Noita
Shared: Physics · Difficult · 2D

Garry's Mod
Shared: Physics · Casual · Simulation

Plague Inc: Evolved
Shared: Simulation · Casual · Indie

Chained Together
Shared: Casual · Platformer · Simulation

Marble Mayhem: Fragile Ball
Shared: Casual · Difficult · 2D

Kerbal Space Program
Shared: Simulation · Physics · Indie

BEEP
Shared: Platformer · Physics · 2D

Cuphead
Shared: Difficult · Platformer · 2D

Goat Simulator
Shared: Simulation · Physics · Casual

Zup! S
Shared: Casual · Physics · 2D

Bridge Constructor Portal
Shared: Simulation · Physics · Difficult

Turbo Pug
Shared: Casual · Difficult · Side Scroller

A Dance of Fire and Ice
Shared: Difficult · 2D · Casual

Climber Animals: Together
Shared: Simulation · Physics · Casual

Celeste
Shared: Difficult · Platformer · Indie

Airscape - The Fall of Gravity
Shared: Casual · Difficult · Platformer

