Games like Hardground
Games like Hardground include Farming Simulator 25, Stardew Valley, Garry's Mod, Goat Simulator, and Farming Simulator 22. We matched them by the tags players give Hardground on Steam (Simulation, Casual, Farming Sim, Sandbox, and Time Management): closest matches first, and among equally close ones the better-known games.

Farming Simulator 25
Shared: Simulation · Farming Sim · 3D

Stardew Valley
Shared: Farming Sim · Simulation · Sandbox

Garry's Mod
Shared: Sandbox · Casual · Physics

Goat Simulator
Shared: Simulation · Sandbox · Casual

Farming Simulator 22
Shared: Simulation · Farming Sim · Sandbox

Out of Ore
Shared: Simulation · Sandbox · Farming Sim

PowerWash Simulator
Shared: Casual · Simulation · Sandbox

Cities: Skylines II
Shared: Simulation · Sandbox · Economy

Planet Coaster
Shared: Simulation · Sandbox · Relaxing

Farm Together
Shared: Simulation · Casual · Farming Sim

Goat Simulator 3
Shared: Sandbox · Simulation · Physics

House Flipper
Shared: Simulation · Casual · Sandbox

DrainSim
Shared: Simulation · Casual · Sandbox

CarX Drift Racing Online
Shared: Simulation · Sandbox · Physics

Transport Fever 3
Shared: Simulation · Casual · Sandbox

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Cities: Skylines
Shared: Simulation · Sandbox · Economy

People Playground
Shared: Sandbox · Physics · Simulation

Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Physics

Placid Plastic Duck Simulator
Shared: Casual · Physics · Simulation

Farmer's Dynasty 2
Shared: Simulation · Farming Sim · Sandbox

Starsand Island
Shared: Farming Sim · Casual · Simulation

Pumping Simulator 2
Shared: Simulation · Casual · Time Management

Universe Sandbox
Shared: Simulation · Sandbox · Physics