Games like Edge Islands
Games like Edge Islands include RimWorld, Oxygen Not Included, Manor Lords, Prison Architect, and Banished. We matched them by the tags players give Edge Islands on Steam (Strategy, Singleplayer, Base Building, Colony Sim, and Building): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Base Building · Strategy · Colony Sim

Oxygen Not Included
Shared: Base Building · Colony Sim · Singleplayer

Manor Lords
Shared: Strategy · Base Building · Simulation

Prison Architect
Shared: Base Building · Building · Strategy

Banished
Shared: Strategy · Colony Sim · Singleplayer

Against the Storm
Shared: Strategy · Base Building · Simulation

Dwarf Fortress
Shared: Base Building · Colony Sim · Strategy

Empires of the Undergrowth
Shared: Strategy · Base Building · Simulation

Frostpunk
Shared: Strategy · Colony Sim · Base Building

Kingdoms and Castles
Shared: Colony Sim · Strategy · Simulation

Cities: Skylines
Shared: Strategy · Building · Simulation

Workers & Resources: Soviet Republic
Shared: Strategy · Base Building · Simulation

Space Haven
Shared: Base Building · Strategy · Colony Sim

Stonehearth
Shared: Colony Sim · Strategy · Building

Norland
Shared: Strategy · Base Building · Simulation

Going Medieval
Shared: Strategy · Base Building · Colony Sim

Foundation
Shared: Strategy · Simulation · Sandbox

Songs of Syx
Shared: Strategy · Colony Sim · Base Building

Endzone - A World Apart
Shared: Strategy · Base Building · Simulation

Ostriv
Shared: Strategy · Colony Sim · Simulation

Cities: Skylines II
Shared: Building · Singleplayer · Simulation

Factorio
Shared: Base Building · Strategy · Sandbox

Settlement Survival
Shared: Colony Sim · Building · Strategy

Jurassic World Evolution
Shared: Strategy · Building · Simulation

