Games Like Roblox With User-Created Worlds & Tycoons (2024)

Steam Workshop: Mods/maps for CS2, TF2, Garry's Mod, Cities: Skylines, etc.
itch.io / Game Jolt: Indie games, many free, browser-playable.
Nexus Mods: Deep single-player modding.

Roblox's "platform-as-a-game" model is unique, but several alternatives offer similar create/play/share loops.

Closest "Platform" Experiences

Platform	Engine/Style	Monetization	Best For
Core (by Manticore)	Unreal Engine 4/5, Lua	Dev revenue share (Core Credits)	High-fidelity 3D, multiplayer, easier than UE raw
Fortnite Creative / UEFN	Unreal Editor for Fortnite (Verse)	Creator Economy 2.0 (payouts)	Battle royale modes, UE learning path
Rec Room	Custom engine, visual scripting	Rec Tokens (dev payouts)	VR/AR cross-play, social hangouts
Dreams (PS4/PS5)	Media Molecule's engine	No direct monetization (yet)	Artistic games, music, sculpture, logic
Crayta (Stadia/Epic/Steam)	Lua, voxel	Creator program	Quick collab, game-jam style

Minecraft (Java/Bedrock): Redstone/command blocks = logic. Servers = tycoons (Hypixel Skyblock, Economy SMPs).
Terraria: 2D sandbox, massive modding (tModLoader), automation/factory tycoons.
Factorio / Satisfactory / Dyson Sphere Program: Pure factory/tycoon optimization. Multiplayer co-op.
Stardew Valley: Farm tycoon + relationships. Co-op 4-player.
Parkitect / Planet Coaster / Park Beyond: Theme park tycoons with workshop sharing.
Two Point Campus / Hospital: Management tycoons, sandbox mode.

For Roblox-like variety + monetization: Core or Fortnite Creative. For deep building/tycoon: Minecraft servers or Factorio.

Online Games