Games like Sudoku-9
Games like Sudoku-9 include A Little to the Left, Hidden Folks, Is This Seat Taken?, Hidden Through Time, and Morphopolis. We matched them by the tags players give Sudoku-9 on Steam (Casual, Point & Click, Education, Puzzle, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

A Little to the Left
Shared: Puzzle · Casual · Point & Click

Hidden Folks
Shared: Casual · Point & Click · Hidden Object

Is This Seat Taken?
Shared: Casual · Puzzle · Cute

Hidden Through Time
Shared: Casual · Point & Click · Puzzle

Morphopolis
Shared: Puzzle · Point & Click · Casual

Samorost 1
Shared: Point & Click · Casual · Puzzle

Unpacking
Shared: Casual · Puzzle · Cute

LEGO® Builder's Journey
Shared: Casual · Puzzle · Cute

Zup! S
Shared: Casual · Puzzle · 2D

Machinarium
Shared: Point & Click · Puzzle · Casual

Zup!
Shared: Casual · Puzzle · 2D

The Room
Shared: Point & Click · Puzzle · Hidden Object

Zup! Q
Shared: Casual · Point & Click · Puzzle

Zup! F
Shared: Casual · Puzzle · 2D

The Tiny Bang Story
Shared: Point & Click · Puzzle · Casual

Zup! 2
Shared: Casual · Puzzle · 2D

Zup! X
Shared: Casual · Puzzle · 2D

Lost and Found Co.
Shared: Point & Click · Hidden Object · Puzzle

When The Past Was Around
Shared: Hidden Object · Cute · Point & Click

Zup! 3
Shared: Casual · Puzzle · 2D

Zup! Z
Shared: Casual · Puzzle · 2D

There Is No Game: Wrong Dimension
Shared: Point & Click · Puzzle · Casual

RetroMaze
Shared: Casual · Puzzle · 2D

Glass Masquerade
Shared: Casual · Puzzle · Point & Click