Deep Sky Creations

Ultimate Emulator / System

Game Boy

The pocket cartridge library, linked across the internet.

RazorGB plays original Game Boy cartridges with their saves and clocks, and needs no firmware. Two players can link their Game Boys across the internet with Internet Linked Play, or share one game with Native Multiplayer.

1989

Platform Nintendo

In Ultimate Emulator Supported
Core
RazorGB
Firmware
Not required
Game files
  • .gb
Players
One per console
Online
Native & Linked Play
Rendering
Original resolution

01 / Current support

Where Game Boy stands today.

Status describes the core, not every game. Compatibility is always title-dependent.

Supported
Owner acceptance is recorded for the core or named play mode; compatibility remains title-dependent.
Core
RazorGB, a first-party core included with Ultimate Emulator. It is chosen automatically for Game Boy games.
Unrated
No comparable per-core performance rating is claimed.
Cheats
Free. In the Game Menu's Cheats section, choose + Add Cheat Code and enter a code you have. There is no built-in cheat list, and cheats are switched off in online multiplayer sessions.

02 / Your collection

The files it plays.

These are the Game Boy game files RazorGB opens. Ultimate Emulator does not supply games; add them from your own collection.

Game files

  • .gb

Set up

03 / Firmware & BIOS

No external firmware required.

RazorGB is complete on its own. Systems shows Game Boy as Not required: add your games and play.

04 / Input

How it plays in your hands.

Connect a controller and it is mapped automatically. Change the layout for every game, for this system only, or for a single game in Settings → Controllers.

Game Boy in Ultimate Emulator

  • The console's own controls: D-pad, A, B, Select and Start.
Controller Setup

05 / Picture

The original picture, on a modern screen.

Window mode, Fit and Integer Scale, aspect ratio, pixel filtering and effects come from Settings → Graphics, for every system or for one game.

Resolution
Drawn at its original resolution, then scaled to your window with Fit or Integer Scale and your choice of pixel filtering and effects.
Palette
Original Game Boy games are shown in neutral grey. There is no palette choice yet.
Sprite Limit
Reduce Flicker is the default; choose Original Hardware for the console's own limit. A choice of Original Hardware you made earlier is kept. It changes the picture only.
Renderer
Shown for information. The system's built-in engine chooses how it draws, with a safe fallback.
Graphics

06 / Your progress

In-game saves and save states.

The game's own

In-game saves

  • Battery-backed cartridge saves are kept as one save file per game. A cartridge clock is saved with it and catches up on the time that passed while the game was closed.
Ultimate Emulator

Save states

  • Available for local play: Quick Save and Quick Load, saved states in the State Manager, Auto-Save and Auto Resume.
  • Coordinated multiplayer sessions have their own state policy.

Rewind is not integrated with this core.

Learn more

07 / Play together

Together, across two PCs.

A system profile does not make a single-player game multiplayer. The game decides how many can play.

On one PC
One player per console. Linking a second console happens across PCs, with Internet Linked Play.
Across PCs
Native Multiplayer, with ROM Mode. Both PCs run the same game in step, and control passes between the two players. Online sessions need Premium for everyone taking part.
Linked play
2-console Internet Linked Play

Internet Linked Play

  • Two Game Boys on two PCs. Each PC runs both consoles, joined by a virtual link cable; only your controls cross the internet.
  • Both players need the same game. Link Play starts by itself when your friend opens it, and both games restart together.
  • A linked session starts both consoles with empty cartridge memory: your own save is not used.
  • There is no linked play between two consoles on one PC.
  • Save states are not available during a linked session.
Multiplayer

08 / Honest compatibility

What to know before you play.

Current limits of the included core, as of this release.

Known limitations

  • RazorGB runs games on cartridges with no mapper and on the MBC1, MBC2, MBC3, MBC5 and MBC7 boards. Games on other boards, including the Game Boy Camera, are declined with a message.
  • Games with a real-time clock cannot be played in Internet Linked Play or Native Multiplayer.
  • Super Game Boy features, such as borders and colour palettes, are not used.
Region
The Game Boy has no regional models, so there is no region setting.
Troubleshooting

09 / Gaming History

Why it mattered.

How Game Boy works in Ultimate Emulator is this page. Why it mattered is in the Gaming History collection.