Games like Sisyphus Upgraded
Games like Sisyphus Upgraded include Garry's Mod, Teardown, Berry Bury Berry, PEAK, and How to Fish. We matched them by the tags players give Sisyphus Upgraded on Steam (Casual, First-Person, Indie, Physics, and Singleplayer): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Physics · Casual · First-Person

Teardown
Shared: Physics · Indie · First-Person

Berry Bury Berry
Shared: First-Person · 3D · Physics

PEAK
Shared: Physics · First-Person · 3D

How to Fish
Shared: Indie · First-Person · Physics

Getting Over It with Bennett Foddy
Shared: Physics · Singleplayer · Indie

Superflight
Shared: Indie · Casual · Singleplayer

Donut County
Shared: Casual · Indie · Physics

RV There Yet?
Shared: First-Person · Physics · Indie

DrainSim
Shared: Casual · First-Person · Physics

Zup! S
Shared: Casual · Indie · Physics

Slime Rancher 2
Shared: Singleplayer · First-Person · Casual

Liars Bar
Shared: Casual · Indie · First-Person

PowerWash Simulator
Shared: Casual · First-Person · 3D

MUSYNX
Shared: Casual · Indie · Singleplayer

Electrician Simulator
Shared: First-Person · Indie · Casual

Leaf it Alone
Shared: Casual · Indie · First-Person

Fireworks Mania - An Explosive Simulator
Shared: Singleplayer · Physics · First-Person

Clustertruck
Shared: First-Person · Singleplayer · Physics

Prison Escape Simulator: Dig Out
Shared: Casual · Physics · First-Person

Golf With Your Friends
Shared: Casual · Indie · Singleplayer

Buckshot Roulette
Shared: First-Person · Indie · Singleplayer

Game Dev Tycoon
Shared: Indie · Casual · Singleplayer

Train Station Renovation
Shared: Casual · Indie · First-Person