Games like Treffen
Games like Treffen include Steep™, 鬼谷八荒 Tale of Immortal, Your Only Move Is HUSTLE, Tomb Raider Game of the Year, and God of War. We matched them by the tags players give Treffen on Steam (Adventure, Simulation, Sports, Action, and 2D Fighter): closest matches first, and among equally close ones the better-known games.

Steep™
Shared: Sports · Simulation · Action

鬼谷八荒 Tale of Immortal
Shared: Simulation · Adventure · Action

Your Only Move Is HUSTLE
Shared: 2D Fighter · Action · Simulation

Tomb Raider Game of the Year
Shared: Adventure · Action · Third Person

God of War
Shared: Adventure · Action · Third Person

Streets of Rage 4
Shared: Action · Beat 'em up · 2D

Russian Life Simulator
Shared: Simulation · Action · 2D

Rise of the Tomb Raider™
Shared: Adventure · Action · Third Person

Punch Club
Shared: Simulation · Beat 'em up · Sports

ICEY
Shared: Action · Adventure · Side Scroller

Batman™: Arkham Knight
Shared: Action · Adventure · Third Person

Crimson Desert Enhanced
Shared: Adventure · Action · Choose Your Own Adventure

Shank 2
Shared: Action · Adventure · Beat 'em up

The Vagrant
Shared: Action · Adventure · 2D

Session: Skate Sim
Shared: Simulation · Sports · Action

Grand Theft Auto V Legacy
Shared: Action · Adventure · Third Person

Dust: An Elysian Tail
Shared: Action · Adventure · 2D

One Finger Death Punch
Shared: Action · 2D Fighter · Beat 'em up

Yakuza Kiwami
Shared: Adventure · Action · Beat 'em up

Castle Crashers®
Shared: Adventure · Beat 'em up · 2D

SANABI
Shared: Action · Adventure · 2D

Deadlight
Shared: Action · Adventure · Side Scroller

Bully: Scholarship Edition
Shared: Adventure · Action · Third Person

Batman™: Arkham Origins
Shared: Adventure · Action · Beat 'em up