Games like The Last Secret
Games like The Last Secret include There Is No Game: Wrong Dimension, Otaku's Adventure, No Case Should Remain Unsolved, Florence, and The Hungry Lamb: Traveling in the Late Ming Dynasty. We matched them by the tags players give The Last Secret on Steam (Adventure, Visual Novel, Interactive Fiction, Point & Click, and Puzzle): closest matches first, and among equally close ones the better-known games.

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

Otaku's Adventure
Shared: Visual Novel · Adventure · Funny

No Case Should Remain Unsolved
Shared: Interactive Fiction · Visual Novel · Puzzle

Florence
Shared: Adventure · Interactive Fiction · Visual Novel

The Hungry Lamb: Traveling in the Late Ming Dynasty
Shared: Visual Novel · Interactive Fiction · Adventure

ATRI -My Dear Moments-
Shared: Visual Novel · Anime · Adventure

Phoenix Wright: Ace Attorney Trilogy
Shared: Visual Novel · Anime · Adventure

Senren * Banka
Shared: Visual Novel · Anime · Adventure

The Mermaid Mask
Shared: Adventure · Point & Click · Interactive Fiction

Deponia
Shared: Adventure · Point & Click · Puzzle

Marco & The Galaxy Dragon
Shared: Visual Novel · Adventure · Anime

If My Heart Had Wings
Shared: Visual Novel · Point & Click · Romance

Return to Monkey Island
Shared: Adventure · Point & Click · Puzzle

Mirror 2: Project X
Shared: Visual Novel · Interactive Fiction · Anime

Danganronpa: Trigger Happy Havoc
Shared: Visual Novel · Anime · Adventure

Vampires' Melody
Shared: Visual Novel · Adventure · Interactive Fiction

Broken Age
Shared: Adventure · Point & Click · Funny

Fox Hime Zero
Shared: Visual Novel · Anime · Adventure

STEINS;GATE
Shared: Visual Novel · Anime · Sci-fi

Chants of Sennaar
Shared: Adventure · Puzzle · Point & Click

Donut County
Shared: Adventure · Puzzle · Funny

LoveChoice
Shared: Visual Novel · Romance · Adventure

AI: The Somnium Files
Shared: Visual Novel · Adventure · Anime

and Roger
Shared: Visual Novel · Interactive Fiction · Point & Click