Games like Duck Life 9: The Flock
Games like Duck Life 9: The Flock include Chained Together, Forza Horizon 5, Kao the Kangaroo: Round 2 (2003 re-release), DAVE THE DIVER, and My Time at Portia. We matched them by the tags players give Duck Life 9: The Flock on Steam (Adventure, Casual, Simulation, Racing, and Sports): closest matches first, and among equally close ones the better-known games.

Chained Together
Shared: Adventure · Casual · Platformer

Forza Horizon 5
Shared: Racing · Adventure · Simulation

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · Racing

DAVE THE DIVER
Shared: Casual · Adventure · Simulation

My Time at Portia
Shared: Simulation · Casual · Adventure

Where Winds Meet
Shared: Adventure · Action RPG · Casual

Slime Rancher 2
Shared: Adventure · Simulation · Casual

Slime Rancher
Shared: Adventure · Simulation · Casual

Luma Island
Shared: Casual · Simulation · Farming Sim

Climber Animals: Together
Shared: Simulation · Casual · Platformer

SPORE™
Shared: Simulation · Casual · Colony Sim

Wobbly Life
Shared: Adventure · Simulation · Casual

Need for Speed™ Unbound
Shared: Racing · Casual · Simulation

Assetto Corsa
Shared: Racing · Simulation · Sports

Hello Kitty Island Adventure
Shared: Adventure · Simulation · Casual

Need for Speed™ Payback
Shared: Racing · Sports · Adventure

Bus World
Shared: Simulation · Adventure · Racing

Steep™
Shared: Sports · Simulation · Adventure

Liftoff®: FPV Drone Racing
Shared: Simulation · Racing · Sports

House Flipper
Shared: Simulation · Casual · Adventure

Uncrashed : FPV Drone Simulator
Shared: Simulation · Racing · Sports

Stardew Valley
Shared: Farming Sim · Simulation · Casual

Disney Speedstorm
Shared: Racing · Casual · Combat Racing

Doloc Town
Shared: Adventure · Farming Sim · Casual