Games like Dark Virus
Games like Dark Virus include Poppy Playtime, Five Nights at Freddy's: Security Breach, Outer Wilds, Firewatch, and The Room 4: Old Sins. We matched them by the tags players give Dark Virus on Steam (Adventure, Horror, Thriller, Exploration, and Puzzle): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Horror · Puzzle · First-Person

Five Nights at Freddy's: Security Breach
Shared: Horror · Exploration · Adventure

Outer Wilds
Shared: Exploration · Adventure · Mystery

Firewatch
Shared: Adventure · Mystery · Exploration

The Room 4: Old Sins
Shared: Adventure · Puzzle · Mystery

Little Nightmares II
Shared: Adventure · Horror · Puzzle

Blue Prince
Shared: Puzzle · Exploration · Mystery

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Adventure · First-Person

Amnesia: Rebirth
Shared: Puzzle · Horror · Adventure

Inside the Backrooms
Shared: Horror · Puzzle · Adventure

The Room
Shared: Puzzle · Adventure · Mystery

Escape the Backrooms
Shared: Horror · Adventure · Exploration

Stray
Shared: Adventure · Exploration · Puzzle

Dread Flats
Shared: Adventure · Horror · Thriller

Little Nightmares
Shared: Horror · Adventure · Puzzle

What Remains of Edith Finch
Shared: Adventure · Exploration · Mystery

Firework
Shared: Horror · Puzzle · Mystery

The Room Two
Shared: Puzzle · Horror · Mystery

Bendy and the Ink Machine
Shared: Horror · Puzzle · First-Person

Lorelei and the Laser Eyes
Shared: Adventure · Horror · Puzzle

SchoolBoy Runaway
Shared: Adventure · Horror · Puzzle

Paper Dolls: Original /
Shared: Adventure · Horror · Thriller

The Witness
Shared: Exploration · Puzzle · First-Person

MiSide
Shared: Horror · First-Person · Thriller