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

Hidden Folks
Shared: Casual · Point & Click · Puzzle

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

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

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

Morphopolis
Shared: Puzzle · Point & Click · Casual

Zup!
Shared: Casual · Puzzle · 2D

Zup! F
Shared: Casual · Puzzle · 2D

Zup! X
Shared: Casual · Puzzle · 2D

Zup! S
Shared: Casual · Puzzle · 2D

Zup! 2
Shared: Casual · Puzzle · 2D

Zup! 3
Shared: Casual · Puzzle · 2D

Samorost 1
Shared: Point & Click · Casual · Puzzle

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

Zup! Zero
Shared: Casual · Puzzle · 2D

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

Unpacking
Shared: Casual · Puzzle · Cute

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

Zup! 8
Shared: Casual · Puzzle · 2D

Machinarium
Shared: Point & Click · Puzzle · Casual

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

Travellin Cats in Paris
Shared: Casual · Puzzle · Hidden Object

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

Zup! Z
Shared: Casual · Puzzle · 2D

Sizeable
Shared: Casual · Puzzle · Hidden Object