Games like METAL SLUG 3
Games like METAL SLUG 3 include METAL SLUG X, METAL SLUG, Broforce, Sonic Mania, and Cuphead. We matched them by the tags players give METAL SLUG 3 on Steam (Arcade, Classic, Action, Side Scroller, and Retro): closest matches first, and among equally close ones the better-known games.

METAL SLUG X
Shared: Arcade · Action · Classic

METAL SLUG
Shared: Arcade · Action · Side Scroller

Broforce
Shared: Action · Co-op · Local Co-Op

Sonic Mania
Shared: Classic · Retro · 2D

Cuphead
Shared: Co-op · Local Co-Op · 2D

METAL SLUG 2
Shared: Arcade · Action · Side Scroller

Streets of Rage 4
Shared: Action · Arcade · 2D

Huntdown
Shared: Action · Side Scroller · Shooter

Contra Anniversary Collection
Shared: Action · Classic · Side Scroller

METAL SLUG XX
Shared: Action · Arcade · Classic

Guns, Gore and Cannoli 2
Shared: Action · Co-op · Side Scroller

Blazing Chrome
Shared: Action · Retro · Side Scroller

Shovel Knight: Treasure Trove
Shared: Retro · Action · 2D

HELLDIVERS™ 2
Shared: Action · Co-op · Online Co-Op

Halo: The Master Chief Collection
Shared: Classic · Co-op · Great Soundtrack

PAYDAY 2
Shared: Action · Co-op · Online Co-Op

Left 4 Dead 2
Shared: Co-op · Action · Shooter

Counter-Strike 2
Shared: Action · Shooter · Co-op

Ikaruga
Shared: Arcade · Classic · Action

BattleBlock Theater®
Shared: Co-op · Local Co-Op · 2D

Capcom Beat 'Em Up Bundle
Shared: Arcade · Action · Classic

Double Dragon: Neon
Shared: Co-op · Arcade · Action

PAC-MAN™ Championship Edition DX+
Shared: Arcade · Classic · Action

DOOM + DOOM II
Shared: Classic · Action · Retro