Games like Ninja 1987
Games like Ninja 1987 include SANABI, Celeste, Teenage Mutant Ninja Turtles: Shredder's Revenge, UFO 50, and Cave Crawler. We matched them by the tags players give Ninja 1987 on Steam (Adventure, Action, Arcade, Action-Adventure, and Side Scroller): closest matches first, and among equally close ones the better-known games.

SANABI
Shared: Action · Adventure · 2D Platformer

Celeste
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Side Scroller · Action-Adventure · Arcade

UFO 50
Shared: Action · Arcade · Adventure

Cave Crawler
Shared: Side Scroller · 2D Platformer · Action-Adventure

Downwell
Shared: Precision Platformer · Arcade · Action

Rogue Legacy 2
Shared: Arcade · Action · Adventure

Prince of Persia The Lost Crown
Shared: Action · Adventure · 2D Platformer

Exit the Gungeon
Shared: Arcade · Action · Adventure

Super Mombo Quest
Shared: Adventure · Action · Arcade

Broforce
Shared: Action · 2D · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · 2D · Pixel Graphics

Kung Fury: Street Rage - Ultimate Edition
Shared: Arcade · Action · Side Scroller

Shovel Knight: Treasure Trove
Shared: Adventure · Action · Pixel Graphics

Sonic Origins
Shared: Action · Adventure · 2D Platformer

NINJA GAIDEN: Ragebound
Shared: Action · 2D Platformer · Side Scroller

Super Meat Boy
Shared: Precision Platformer · 2D Platformer · 2D

Huntdown
Shared: Action · Side Scroller · Pixel Graphics

VVVVVV
Shared: Precision Platformer · 2D Platformer · Pixel Graphics

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

Blasphemous 2
Shared: Adventure · 2D Platformer · Side Scroller

I wanna be the Creator
Shared: Action · Adventure · Action-Adventure

Jump King
Shared: Adventure · Precision Platformer · Action

Sonic Mania
Shared: 2D · Adventure · Action

