Build the World
Campaigns, story nodes, locations, maps, NPCs, items, monsters and encounters all connect together.
Tabletop RPG platform — in development
GAME MASTER
PLAY TABLETOP LIKE A TACTICAL RPG.
Build campaigns, create maps, manage monsters and run sessions from one app. Players see an interactive tactical view while the Game Master controls the world behind the screen.
Tactical Player View
First tap previews. Second tap commits. Cyan cells are legal movement. Gold is the preview position. Hidden cells stay hidden from players.
More Than a Virtual Tabletop
Game Master is a cross-platform tabletop RPG platform built around tactical play and complete GM control. It handles the bookkeeping so the group can concentrate on playing.
The GM builds the campaign, prepares maps and encounters, controls hidden information and makes final rulings. Players interact with the world through a tactical interface that shows movement, weapon ranges, spells and available actions — without taking control away from the GM.
Fantasy is the first ruleset. The architecture is built so additional RPG systems can be added later. Players will not need physical maps, dice or cameras. Online play from anywhere is the long-term product; local sessions work in the current development build.
Play Tactically
Players preview movement, ranges and targets directly on the board before committing.
GM Has Final Authority
The rules engine assists the GM. It never outranks the GM.
Tactical Player View
First tap previews. Second tap commits.
Press Move. Legal movement cells highlight. Tap a destination once and a preview — a ghost of the character — appears there. Weapon and spell ranges recalculate from that position. Line of sight and valid targets update. Try another square if you want. Tap the selected position again to confirm.
01Select Move
02Preview position
03See attack ranges
04Confirm
Buttons for what the game understands. GM rulings for everything else.
Attack
Lists every usable weapon in inventory. No videogame-style equip step.
- LongswordIn Range
- Short BowClear Shot
- DaggerOut of Range
Spell
Opens the character’s spellbook and shows valid targeting from the current or previewed cell.
Item
Shows usable inventory — potions, tools, keys — without leaving the board.
Search
Highlights nearby searchable objects the character can actually reach.
Interact
Doors, chests, stairs and other structured map objects.
Other
Write any action the software did not anticipate. The GM reviews it.
See Game Master in Action
Interface previews of the current development build. Captured screenshots will replace these frames as they are added.
Tactical Player View
Tactical Player View
Players see the board, legal actions and only the information their character should have.
Movement preview
Preview Before You Move
Test a destination and see weapon and spell ranges before committing.
GM session
GM Active Session
The GM sees hidden creatures, full logs and override tools the players never get.
Map Maker
Map Maker
Paint a grid like a game level. Walls, tiles and objects are real data, not a flat picture.
Character Creator
Character Creator
Create your own, start from a suggested build, or take a premade character.
Monster Library
Monster Library
Templates, custom creatures, variants, attacks, resistances and loot.
Encounter Builder
Encounter Builder
Attach fights to locations, place monsters, set waves, triggers and rewards.
Story / Locations
Story and Locations
Plan the investigation, connect rooms and roads, and keep each scene on its own map.
The GM Is Always in Control
Automated rules are proposals, not absolute decisions. Game Master helps run the rules. It does not replace the person running the game.
A character reaches lethal HP? The app may say character would die. The GM still chooses what happens.
CHARACTER WOULD DIE
Accept Death
Unconscious
Stabilize
Set HP
Ignore Result
Game Master helps run the rules. It does not replace the person running the game.
Other overrides already in the local session:
- Change HP
- Override hit / miss
- Change damage
- Move characters or monsters
- Change initiative
- Open or close doors
- Change rewards
- Ignore or change a rule
Build As Much — Or As Little — As You Want
Author a world from a blank campaign, or start from a prepared adventure and make it yours. Nothing in the starter is locked.
Build from scratch
- Story planner
- Locations
- Map Maker
- NPC library
- Items and rewards
- Monster Library
- Encounter Builder
- Character rules
Quick Start
Install a prepared adventure and customize it. The current built-in starter is The Ruins of Black Hollow — a level 1 investigation already stocked with maps, NPCs, monsters, encounters and premade characters.
Built into the current development build. Not a public download.
Build Maps Like a Game Level
Map Maker is meant to be approachable — not professional CAD. Paint a grid, drop objects, and the session engine can use them.
Maps are not merely pictures. Objects exist as structured game entities, so a door can later be opened, locked or hidden. Background images can be imported and aligned to the grid.
Grid paintingGround / terrain / decorationPencilEraserRectangle fillFlood fillLineUndo / redoSelectMoveCopy / pasteCustom image tilesStarter tilesTile packsAuto-joining wallsImported backgroundsGrid alignmentPan and zoom
Interactive objects
DoorsChestsTrapsStairs / exitsFurnitureSpawn markersGM notesCustom objects
Character Creation Without Needing the Rulebook Open
Three ways in. Helpers stay on screen so a new player can finish a legal character without flipping pages.
Create My Own
Step-by-step choices with beginner explanations for every field.
Suggested Build
“I want to sneak and scout.” Game Master can suggest Rogue-style builds without forcing the choice.
Premade Character
A complete character, ready to play. Customize it, or sit down immediately.
Name suggestionsPlay-style questionsBeginner explanationsStat rollingStandard arrayPoint poolEquipment suggestionsSpell selectionPortraitsBackgrounds
Stock the World
These are GM authoring tools. Players do not build the monster list or place the ambush unless the GM hands them that work.
Monster Library
- Built-in templates
- Custom monsters
- Duplicate a monster into a variant
- Attacks and special abilities
- Movement, resistances and weaknesses
- Loot
Encounter Builder
- Attach encounters to locations
- Choose maps
- Add monster quantities
- Set starting positions
- Waves and triggers
- Rewards and story links
Split the Party Without Splitting the Table
A Location can be a tavern, a forest clearing, a dungeon chamber, a road, a castle courtyard, or an entire outdoor region. Characters occupy Locations.
Players in different Locations can eventually have different scenes, information, encounters and turn queues. Game Master is being designed so one group fighting in the crypt does not force a player searching the library to wait through every unrelated combat turn.
Full multi-device / online Locations — planned
Locations, maps and local session movement between them exist in the current development build. Shared remote tables are not available yet.
Your Character Knows What Your Character Knows
The GM can reveal information to everyone, one Location, one player, or GM only.
Example: the Rogue recognizes a thieves’ mark. The other players do not automatically see that information. Hidden monsters stay off the player board until the GM reveals them.
This already works in the local simulated-player architecture. Online delivery to remote devices is future work.
Included Starter Adventure
The Ruins of Black Hollow
A small settlement is suffering disappearances. Travelers are vanishing on a nearby forest road, and strange activity surrounds abandoned ruins. The party investigates the village, follows clues into the woods, and descends to stop what is waking there.
Built into the current development build. Not publicly downloadable.
Release plan — not purchasable today
Players Join Free
The planned model is simple: the GM buys the GM tools once. Players joining that GM’s campaigns play free.
Optional content may later include map packs, tile packs and adventure packs. A player should not need to purchase a map or adventure owned by the GM in order to play that campaign.
No public store listing and no prices yet.
Coming with online play
Find a Game
Planned online features for when remote sessions exist.
- Find Groups and Find Campaigns as separate lists
- Groups can persist through multiple campaigns
- Campaigns can accept individual players
- DMs can recruit players
- Players can leave; DMs can remove disruptive players
- Block / report for serious abuse
Development Status
Game Master is in active development. There is no public download, store listing, account system or online multiplayer yet.
Working locally now
- Campaign creation
- Story planning
- Locations
- Map Maker
- NPCs
- Items
- Character Creator
- Monster Library
- Encounter Builder
- The Ruins of Black Hollow
- Local active sessions
- GM view
- Simulated player view
- Tactical movement preview
- Dice
- Basic range / line-of-sight
- GM overrides
- Windows build
- Android test build
Still to come
- Real online multiplayer
- Shared remote sessions
- Accounts / cloud synchronization
- Group Finder
- Campaign Finder
- iOS testing / release
- Public downloads / store release
- Content marketplace
Platforms
Built with Flutter so the client shares one codebase across devices. No release date is set.
Current development platforms
Windows
Android
Planned
iPhone / iPad
Follow the Project
Game Master is a Frozen Dungeon original. The long-term product is play from anywhere. The current build is the local foundation for that.