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Play Master of the Monster Lair (US edition) Online
Master of the Monster Lair
Play Master of the Monster Lair online. Design monster-attracting rooms, explore your dungeon and fight for materials.
Browser play

Nintendo DS (NDS) — EmulatorJS controls
Default Player 1 keyboard mapping. Change keys in Controller Settings.
| Console button | Keyboard |
|---|---|
| ↑ / ↓ / ← / → | ↑ / ↓ / ← / → |
| A / B / X / Y | Z / X / A / S |
| L / R | Q / E |
| START / SELECT | Enter / V |
| Microphone | Not assigned |
Open Controller Settings to configure your keyboard or gamepad. Touch controls are available on mobile.
How to Play Master of the Monster Lair
Quick start
Follow the shovel’s introduction, dig a short connected route and place the first available room. Return to explore after monsters move in, choose battle commands and review the loot. Restock and improve the layout before pushing farther underground.
Controls
Use the DS directional and menu controls to move, inspect the dungeon plan and select digging or room placement. Confirm RPG battle commands from the displayed menu, checking a target before committing. Read room descriptions to learn which monster type a new space is intended to attract.
Master of the Monster Lair — About this game
A talking shovel draws a young hero into building a dungeon to lure monsters away from South Arc. Dig connected passages, install rooms and return later to meet the creatures attracted by those choices. A cellar, stable or chapel can bring different opponents, so construction determines what you can hunt for weapons, items and food ingredients. Battles use RPG commands rather than action-platform timing, and preparation matters when extending to a deeper floor. Begin with a modest layout, explore it and use the rewards to improve equipment and future rooms instead of filling every space immediately. Begin with the opening instructions and practice the main interaction before pursuing optional rewards. Read the current objective, make one deliberate choice and watch its effect before repeating it. A short first session makes it easier to separate a missed instruction from a difficult challenge. Return to the available menu when you need to check progress or adjust your approach, then continue from the next clear objective.
Master of the Monster Lair Game manuals
Cheats
No cheats have been added for this edition.
Player verification and sources
Browser play was reviewed before this edition was published in the catalogue. The date below is the catalogue publication date, not the game’s original release date.
- Browser test and catalogue publication date
- Browsers and devices
- PC: Chrome, Edge and Firefox. Mobile: Chrome on Android and Safari on iPhone and iPad.
- Player engine and core
- EmulatorJS 4.3.0-pre · nds
- Tested by
- rwEmulator
Sources and editorial basis
rwEmulator reviews edition metadata, release information, game manuals and first-hand browser-play notes. Available manuals are linked below; the editorial policy explains how facts are checked and corrections are handled.