Games like Custom Party
Games like Custom Party include Pummel Party, Tom Clancy's Rainbow Six Siege, Counter-Strike 2, NARAKA: BLADEPOINT, and Party Animals. We matched them by the tags players give Custom Party on Steam (Multiplayer, Minigames, Party Game, Party, and Combat): closest matches first, and among equally close ones the better-known games.

Pummel Party
Shared: Multiplayer · Party Game · Minigames

Tom Clancy's Rainbow Six Siege
Shared: PvP · Multiplayer · eSports

Counter-Strike 2
Shared: Multiplayer · PvP · Action

NARAKA: BLADEPOINT
Shared: Multiplayer · PvP · Character Customization

Party Animals
Shared: Multiplayer · Party Game · PvP

Draw & Guess
Shared: Multiplayer · Party · Party Game

Dota 2
Shared: Multiplayer · PvP · eSports

Mecha BREAK
Shared: PvP · Multiplayer · Combat

Gang Beasts
Shared: Multiplayer · Party Game · PvP

Ultimate Chicken Horse
Shared: Multiplayer · Party · PvP

Pixel Gun 3D: PC Edition
Shared: PvP · Multiplayer · Combat

TEKKEN 8
Shared: Multiplayer · PvP · Action

ARMORED CORE™ VI FIRES OF RUBICON™
Shared: Character Customization · Combat · Multiplayer

Among Us
Shared: Multiplayer · Party Game · PvP

DRAGON BALL: Sparking! ZERO
Shared: Multiplayer · PvP · Combat

Marvel Rivals
Shared: Multiplayer · PvP · Action

Slappyball
Shared: Multiplayer · PvP · Character Customization

Mage Arena
Shared: PvP · Magic · Combat

LEGO® Party!
Shared: Multiplayer · Party Game · Party

PUBG: BATTLEGROUNDS
Shared: Multiplayer · PvP · Action

Rubber Bandits
Shared: Multiplayer · Party Game · Party

THE FINALS
Shared: Multiplayer · PvP · Action

MECCHA CHAMELEON
Shared: Multiplayer · Party Game · PvP

Apex Legends™
Shared: Multiplayer · PvP · Action