A downloadable game for Windows

MONSTER CODEX is an adult dark fantasy visual novel and a standalone sequel to MONSTERLAY.

The royal court has tasked you with completing a monster codex. Explore different regions, discover monsters, and collect character and event cards as you learn about each species and its way of life.

Free Windows release — 2026.10.7

• 6 playable characters.

• English, Japanese, and Simplified Chinese.

• No payment or Patreon membership is required.

Download the ZIP below and extract it completely. Open the MonsterCodex folder and run MonsterCodex.exe. Choose your language in the game settings.

Support development: https://www.patreon.com/monsterlay

This project is in active development. For adults only (18+); contains explicit adult content.

More information

Published	6 days ago
Status	In development
Platforms	Windows
Author	Monsterlay
Genre	Visual Novel
Tags	Adult, Dark Fantasy, Exploration, Male protagonist, Monsters
Average session	A few seconds
Languages	English, Japanese, Chinese (Simplified)
AI Disclosure	AI Assisted, Graphics, Text

Download

MonsterCodex_free-2026.10.7.zip 708 MB

Install instructions

1. Download MonsterCodex_free-2026.10.7.zip.

2. Extract the entire ZIP.

3. Open the MonsterCodex folder and run MonsterCodex.exe.

4. Choose English, Japanese, or Simplified Chinese in the game settings.

Keep all extracted files and folders together, including the data and text folders, .pak files, and DLL files.

MONSTER CODEX

Download

Install instructions

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