Games like 6600:The Park
Games like 6600:The Park include Five Nights at Freddy's: Security Breach, Crimson Desert Enhanced, Lethal Company, Stray, and Five Nights at Freddy's: Secret of the Mimic. We matched them by the tags players give 6600:The Park on Steam (Exploration, Adventure, PvE, Action-Adventure, and Horror): closest matches first, and among equally close ones the better-known games.

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

Crimson Desert Enhanced
Shared: Exploration · Adventure · Singleplayer

Lethal Company
Shared: Horror · Exploration · PvE

Stray
Shared: Adventure · Exploration · Singleplayer

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

Rise of the Tomb Raider™
Shared: Adventure · Exploration · Action-Adventure

Amnesia: Rebirth
Shared: Action-Adventure · Adventure · Exploration

Cairn
Shared: Exploration · Adventure · Indie

Little Nightmares II
Shared: Adventure · Horror · Singleplayer

Outer Wilds
Shared: Exploration · Adventure · Singleplayer

Subnautica
Shared: Exploration · Horror · Adventure

Escape the Backrooms
Shared: Horror · Exploration · Adventure

Firewatch
Shared: Adventure · Exploration · Singleplayer

Tomb Raider Game of the Year
Shared: Adventure · Exploration · Singleplayer

Subnautica: Below Zero
Shared: Exploration · Horror · Adventure

PILGRIM
Shared: Exploration · Horror · PvE

The Forest
Shared: Horror · Adventure · Exploration

Slime Rancher
Shared: Exploration · Adventure · Singleplayer

Five Nights at Freddy's: Into the Pit
Shared: Adventure · Horror · Exploration

Hogwarts Legacy
Shared: Adventure · Exploration · Singleplayer

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

Lost in Random™
Shared: Adventure · Action-Adventure · Exploration

Assassin's Creed® Odyssey
Shared: Action-Adventure · Exploration · Singleplayer

UNCHARTED™: Legacy of Thieves Collection
Shared: Adventure · Action-Adventure · Exploration