Games like Happy Day
Games like Happy Day include Bejeweled® 3, Zup! S, Zuma Deluxe, Mini Metro, and Hexcells. We matched them by the tags players give Happy Day on Steam (Casual, Puzzle, Match 3, 2D, and Colorful): closest matches first, and among equally close ones the better-known games.

Bejeweled® 3
Shared: Casual · Puzzle · Match 3

Zup! S
Shared: Casual · Puzzle · 2D

Zuma Deluxe
Shared: Puzzle · Match 3 · Casual

Mini Metro
Shared: Puzzle · Strategy · Casual

Hexcells
Shared: Casual · Puzzle · Indie

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

Zup!
Shared: Casual · Puzzle · 2D

A Little to the Left
Shared: Puzzle · Casual · Relaxing

ISLANDERS
Shared: Puzzle · Relaxing · Strategy

Mini Motorways
Shared: Casual · Puzzle · Strategy

Plants vs. Zombies GOTY Edition
Shared: Casual · Strategy · 2D

Zup! 3
Shared: Casual · Puzzle · 2D

Strange Jigsaws
Shared: Casual · Puzzle · 2D

Hexcells Infinite
Shared: Casual · Puzzle · Relaxing

Assemble with Care
Shared: Casual · Puzzle · Relaxing

Zup! F
Shared: Casual · Puzzle · 2D

Zup! 2
Shared: Casual · Puzzle · 2D

Glass Masquerade
Shared: Puzzle · Casual · Relaxing

Hook
Shared: Casual · Puzzle · Relaxing

Zup! X
Shared: Casual · Puzzle · 2D

Unpacking
Shared: Casual · Relaxing · Puzzle

A Game About Feeding A Black Hole
Shared: Casual · Relaxing · 2D

Terra Nil
Shared: Puzzle · Relaxing · Strategy

Zuma's Revenge!
Shared: Casual · Puzzle · Match 3