Games like Block Party
Games like Block Party include Garry's Mod, House Flipper, PowerWash Simulator, MECCHA CHAMELEON, and Trove. We matched them by the tags players give Block Party on Steam (Casual, Design & Illustration, Party Game, Sandbox, and Massively Multiplayer): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Casual · Moddable

House Flipper
Shared: Design & Illustration · Casual · Sandbox

PowerWash Simulator
Shared: Casual · Sandbox · 3D

MECCHA CHAMELEON
Shared: Casual · Party Game · Multiplayer

Trove
Shared: Sandbox · Voxel · Pixel Graphics

Terraria
Shared: Sandbox · Pixel Graphics · Multiplayer

Bloons TD 6
Shared: Casual · 3D · Sandbox

Stardew Valley
Shared: Pixel Graphics · Sandbox · Multiplayer

Tiny Glade
Shared: Design & Illustration · Casual · Sandbox

WEBFISHING
Shared: Casual · 3D · Multiplayer

Draw & Guess
Shared: Casual · Party Game · Multiplayer

Party Animals
Shared: Casual · Party Game · Multiplayer

My Dream Setup
Shared: Design & Illustration · Casual · Sandbox

SUMMERHOUSE
Shared: Casual · Sandbox · Colorful

PixARK
Shared: Massively Multiplayer · Sandbox · Casual

Furnish Master
Shared: Design & Illustration · Sandbox · Colorful

Among Us
Shared: Party Game · Casual · Multiplayer

House Flipper 2
Shared: Casual · Design & Illustration · Co-op

Starbound
Shared: Sandbox · Pixel Graphics · Casual

Tower Unite
Shared: Casual · Massively Multiplayer · Sandbox

Car Service Together
Shared: Casual · Sandbox · 3D

Liars Bar
Shared: Casual · 3D · Multiplayer

Pummel Party
Shared: Party Game · Casual · Multiplayer

Factorio
Shared: Sandbox · Casual · Multiplayer