Games like ニコニコさん | Niconico-san
Games like ニコニコさん | Niconico-san include The Exit 8, Platform 8, Five Nights at Freddy's: Security Breach, The Complex: Expedition, and Internet Cafe Simulator 2. We matched them by the tags players give ニコニコさん | Niconico-san on Steam (Exploration, Immersive Sim, Hidden Object, Walking Simulator, and 3D): closest matches first, and among equally close ones the better-known games.

The Exit 8
Shared: Exploration · Walking Simulator · Immersive Sim

Platform 8
Shared: Walking Simulator · Exploration · Hidden Object

Five Nights at Freddy's: Security Breach
Shared: Horror · Exploration · 3D

The Complex: Expedition
Shared: Exploration · Horror · Realistic

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

Firewatch
Shared: Walking Simulator · Exploration · Adventure

The Cabin Factory
Shared: Walking Simulator · Immersive Sim · Horror

Who's at the door?
Shared: Immersive Sim · Walking Simulator · Simulation

Scanner Sombre
Shared: Exploration · Walking Simulator · Horror

The Escape: Together
Shared: Exploration · Immersive Sim · Horror

Summon
Shared: Simulation · Exploration · Horror

September 7th
Shared: Exploration · Walking Simulator · Horror

What Remains of Edith Finch
Shared: Walking Simulator · Exploration · Mystery

Dollmare
Shared: 3D · Horror · Simulation

The Forest
Shared: Horror · Exploration · Action

The Mortuary Assistant
Shared: Horror · Simulation · Demons

[Chillas Art] The Closing Shift
Shared: Simulation · Immersive Sim · Action

HELLMART
Shared: Exploration · Horror · Immersive Sim

Amenti
Shared: Exploration · Horror · Walking Simulator

Five Nights at Freddy's: Secret of the Mimic
Shared: Horror · Exploration · 3D

Project Silverfish
Shared: Immersive Sim · Exploration · Horror

CARIMARA: Beneath the forlorn limbs
Shared: Exploration · 3D · Horror

IRON NEST: Heavy Turret Simulator
Shared: Simulation · 3D · Immersive Sim

Euro Truck Simulator 2
Shared: Simulation · Exploration · Immersive Sim