Games like Piground
Games like Piground include Liars Bar, Terraria, Bloons TD 6, Tabletop Simulator, and Garry's Mod. We matched them by the tags players give Piground on Steam (Casual, Board Game, Sandbox, Real Time Tactics, and 2D): closest matches first, and among equally close ones the better-known games.

Liars Bar
Shared: Casual · PvP · Multiplayer

Terraria
Shared: Sandbox · 2D · Multiplayer

Bloons TD 6
Shared: Casual · Strategy · Sandbox

Tabletop Simulator
Shared: Board Game · Sandbox · Casual

Garry's Mod
Shared: Sandbox · Casual · Multiplayer

Rento Fortune: Online Dice Board Game (大富翁)
Shared: Casual · Board Game · Strategy

Don't Starve Together
Shared: Sandbox · 2D · Co-op

100% Orange Juice
Shared: Board Game · Casual · Strategy

ShellShock Live
Shared: 2D · Casual · Strategy

The Escapists 2
Shared: 2D · Strategy · Sandbox

UNO
Shared: Board Game · Casual · Multiplayer

Draw & Guess
Shared: Casual · 2D · PvP

Plague Inc: Evolved
Shared: Casual · Strategy · Indie

MECCHA CHAMELEON
Shared: Casual · Multiplayer · Real Time Tactics

Starbound
Shared: Sandbox · Casual · 2D

Factorio
Shared: Sandbox · Casual · Strategy

Among Us
Shared: 2D · Casual · Multiplayer

Richman 11
Shared: Casual · Board Game · PvP

Dorfromantik
Shared: Casual · Board Game · Sandbox

Richman10
Shared: Casual · Board Game · Strategy

Castle Crashers®
Shared: 2D · Casual · Co-op

Pummel Party
Shared: Board Game · Casual · Multiplayer

Game Dev Tycoon
Shared: Casual · 2D · Strategy

Agrou
Shared: Casual · Board Game · Strategy