Games like Suicide Countdown: 7 Days
Games like Suicide Countdown: 7 Days include Milk inside a bag of milk inside a bag of milk, No Case Should Remain Unsolved, Lay a Beauty to Rest: The Darkness Peach Blossom Spring, Firework, and The Hungry Lamb: Traveling in the Late Ming Dynasty. We matched them by the tags players give Suicide Countdown: 7 Days on Steam (Adventure, Visual Novel, Interactive Fiction, Puzzle, and Dating Sim): closest matches first, and among equally close ones the better-known games.

Milk inside a bag of milk inside a bag of milk
Shared: Visual Novel · Horror · Interactive Fiction

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

Lay a Beauty to Rest: The Darkness Peach Blossom Spring
Shared: Adventure · Visual Novel · Interactive Fiction

Firework
Shared: Puzzle · Horror · Visual Novel

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

Danganronpa 2: Goodbye Despair
Shared: Visual Novel · Adventure · Anime

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

Sanfu
Shared: Adventure · Puzzle · Visual Novel

PARANORMASIGHT: The Seven Mysteries of Honjo
Shared: Adventure · Visual Novel · Horror

Tales of the Black Forest
Shared: Adventure · Horror · Visual Novel

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

Otaku's Adventure
Shared: Visual Novel · Dating Sim · Adventure

Raging Loop
Shared: Visual Novel · Adventure · Psychological Horror

Sally Face - Episode One
Shared: Adventure · Puzzle · Horror

The NOexistenceN of you AND me
Shared: Visual Novel · Interactive Fiction · Anime

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Horror · Interactive Fiction

Danganronpa V3: Killing Harmony
Shared: Visual Novel · Anime · Adventure

The Mermaid Mask
Shared: Adventure · Puzzle · Interactive Fiction

Return to Shironagasu Island
Shared: Adventure · Visual Novel · Horror

Zero Escape: Zero Time Dilemma
Shared: Visual Novel · Puzzle · Adventure

Scarlet Hollow
Shared: Visual Novel · Horror · Dating Sim

Her Story
Shared: Interactive Fiction · Investigation · Puzzle

Yog-Sothoth’s Yard
Shared: Dating Sim · Visual Novel · Horror

Killer Frequency
Shared: Adventure · Interactive Fiction · Puzzle