Games like The Missing Rune
Games like The Missing Rune include Buckshot Roulette, MiSide, No, I'm not a Human, CloverPit, and Five Nights at Freddy's. We matched them by the tags players give The Missing Rune on Steam (Simulation, Strategy, Horror, Psychological Horror, and Sci-fi): closest matches first, and among equally close ones the better-known games.

Buckshot Roulette
Shared: Horror · Strategy · Singleplayer

MiSide
Shared: Psychological Horror · Horror · Singleplayer

No, I'm not a Human
Shared: Horror · Psychological Horror · Singleplayer

CloverPit
Shared: Strategy · Psychological Horror · Horror

Five Nights at Freddy's
Shared: Horror · Singleplayer · Psychological Horror

Lobotomy Corporation | Monster Management Simulation
Shared: Simulation · Psychological Horror · Horror

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Singleplayer

Quarantine Zone: The Last Check
Shared: Simulation · Singleplayer · First-Person

Welcome to the Game II
Shared: Horror · Strategy · Psychological Horror

Ultimate Custom Night
Shared: Horror · Singleplayer · Strategy

Five Nights at Freddy's 3
Shared: Horror · Singleplayer · Psychological Horror

Five Nights at Freddy's 2
Shared: Horror · Singleplayer · Psychological Horror

911 Operator
Shared: Simulation · Strategy · Singleplayer

Poppy Playtime
Shared: Horror · Singleplayer · Psychological Horror

Plague Inc: Evolved
Shared: Simulation · Strategy · Singleplayer

Escape the Backrooms
Shared: Horror · Psychological Horror · First-Person

Lethal Company
Shared: Horror · First-Person · Psychological Horror

SOMA
Shared: Horror · Psychological Horror · Sci-fi

Garten of Banban
Shared: Horror · Psychological Horror · Singleplayer

Outlast
Shared: Horror · Psychological Horror · First-Person

The Cabin Factory
Shared: Horror · Psychological Horror · Simulation

Five Nights at Freddy's 4
Shared: Horror · Singleplayer · First-Person

Five Nights at Freddy's: Sister Location
Shared: Horror · Singleplayer · Strategy

Ready or Not
Shared: Horror · Singleplayer · Realistic