Games like 429 - Four Twenty Knight
Games like 429 - Four Twenty Knight include s&box, House Flipper, DR LIVESEY ROM AND DEATH EDITION, Cult of the Lamb, and Arma 3. We matched them by the tags players give 429 - Four Twenty Knight on Steam (Action, Casual, Simulation, 3D Fighter, and Beat 'em up): closest matches first, and among equally close ones the better-known games.

s&box
Shared: Casual · Action · 3D Platformer

House Flipper
Shared: Simulation · Casual · Action

DR LIVESEY ROM AND DEATH EDITION
Shared: Action · Cartoon · Beat 'em up

Cult of the Lamb
Shared: Action Roguelike · Dungeon Crawler · Cute

Arma 3
Shared: Action · Simulation · First-Person

PowerWash Simulator
Shared: Casual · Simulation · 3D

SPORE™
Shared: Simulation · Casual · Action

Ultimate Epic Battle Simulator 2
Shared: Simulation · Action · Strategy

Internet Cafe Simulator 2
Shared: Simulation · 3D · Action

Prison Escape Simulator: Dig Out
Shared: Simulation · Casual · Action

Judgment
Shared: Action · Beat 'em up · 3D Fighter

Goat Simulator
Shared: Simulation · Casual · Action

War Thunder
Shared: Action · Simulation · Combat

Embr
Shared: Action · Casual · Simulation

Slime Rancher 2
Shared: Simulation · Casual · Cute

SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Shared: Action · 3D Platformer · Casual

Demon Slayer -Kimetsu no Yaiba- The Hinokami Chronicles
Shared: Action · 3D Fighter · 3D

KovaaK's
Shared: Action · Simulation · First-Person

Aimlabs
Shared: Action · Simulation · First-Person

Insaniquarium Deluxe
Shared: Casual · Simulation · Cute

Slime Rancher
Shared: Cute · Simulation · Casual

Total Tank Simulator
Shared: Action · Simulation · Strategy

Hades
Shared: Action · Action Roguelike · Dungeon Crawler

Just Go
Shared: Casual · Simulation · Strategy