Games like Kindergarten 3
Games like Kindergarten 3 include There Is No Game: Wrong Dimension, Kindergarten, Kindergarten 2, Undertale, and South Park™: The Stick of Truth™. We matched them by the tags players give Kindergarten 3 on Steam (Dark Humor, Dark Comedy, Choose Your Own Adventure, Puzzle, and Pixel Graphics): closest matches first, and among equally close ones the better-known games.

There Is No Game: Wrong Dimension
Shared: Puzzle · Pixel Graphics · Funny

Kindergarten
Shared: Dark Humor · Pixel Graphics · Funny

Kindergarten 2
Shared: Pixel Graphics · Dark Humor · Puzzle

Undertale
Shared: Pixel Graphics · Funny · Story Rich

South Park™: The Stick of Truth™
Shared: Dark Humor · Comedy · Funny

Deponia
Shared: Puzzle · Comedy · Adventure

Portal 2
Shared: Dark Humor · Puzzle · Funny

OneShot
Shared: Pixel Graphics · Puzzle · Story Rich

The Henry Stickmin Collection
Shared: Choose Your Own Adventure · Funny · Comedy

Reventure
Shared: Pixel Graphics · Dark Humor · Adventure

Finding Paradise
Shared: Pixel Graphics · Story Rich · Adventure

To the Moon
Shared: Pixel Graphics · Story Rich · Interactive Fiction

Tales from the Borderlands
Shared: Comedy · Adventure · Choose Your Own Adventure

South Park™: The Fractured But Whole™
Shared: Dark Humor · Comedy · Funny

Outcore: Desktop Adventure
Shared: Puzzle · Comedy · Adventure

LISA: The Painful
Shared: Dark Humor · Pixel Graphics · Story Rich

Kraken Academy!!
Shared: Dark Humor · Funny · Comedy

No Case Should Remain Unsolved
Shared: Puzzle · Interactive Fiction · Pixel Graphics

Return to Monkey Island
Shared: Puzzle · Comedy · Adventure

Refind Self: The Personality Test Game
Shared: Interactive Fiction · Pixel Graphics · Choose Your Own Adventure

DELTARUNE
Shared: Pixel Graphics · Funny · Story Rich

Dude, Stop
Shared: Puzzle · Pixel Graphics · Funny

Thimbleweed Park™
Shared: Pixel Graphics · Puzzle · Adventure

Breakout 13
Shared: Choose Your Own Adventure · Interactive Fiction · Puzzle