Games like Secret Number Simulator
Games like Secret Number Simulator include Little Inferno, Garry's Mod, Human Fall Flat, There Is No Game: Wrong Dimension, and MECCHA CHAMELEON. We matched them by the tags players give Secret Number Simulator on Steam (Hidden Object, Puzzle, Casual, Sandbox, and 3D): closest matches first, and among equally close ones the better-known games.

Little Inferno
Shared: Casual · Puzzle · Funny

Garry's Mod
Shared: Sandbox · Casual · Funny

Human Fall Flat
Shared: Puzzle · Funny · Sandbox

There Is No Game: Wrong Dimension
Shared: Puzzle · Casual · Funny

MECCHA CHAMELEON
Shared: Casual · Hidden Object · Funny

Hidden Folks
Shared: Hidden Object · Casual · Puzzle

Goat Simulator
Shared: Sandbox · Funny · Casual

The House of Da Vinci
Shared: Hidden Object · Puzzle · 3D

Donut County
Shared: Casual · Puzzle · Funny

Scribblenauts Unlimited
Shared: Puzzle · Casual · Sandbox

Sizeable
Shared: Puzzle · Hidden Object · Casual

Librarian: Tidy Up the Arcane Library!
Shared: Casual · Puzzle · Hidden Object

The Room
Shared: Puzzle · Hidden Object · Casual

Moncage
Shared: Puzzle · Casual · Indie

Boxes: Lost Fragments
Shared: Puzzle · Casual · Hidden Object

Totally Accurate Battle Simulator
Shared: Sandbox · Funny · 3D

Duck Detective: The Secret Salami
Shared: Casual · Detective · Puzzle

Liars Bar
Shared: Casual · Funny · 3D

The Room 4: Old Sins
Shared: Puzzle · Hidden Object · Mystery

The Room Two
Shared: Puzzle · Hidden Object · Mystery

PowerWash Simulator
Shared: Casual · 3D · Sandbox

Big Walk
Shared: Puzzle · Casual · Funny

Morphopolis
Shared: Puzzle · Hidden Object · Casual

Fingered
Shared: Casual · Puzzle · Detective