Invasion of the Geminorons is a sci-fi puzzle game for Game Boy Color and Analogue Pocket.

The download includes a .gbc ROM file for use with an emulator or a real Game Boy Color, a .pocket file for use with an Analogue Pocket, and a PDF manual.

Users of the app: if you visit this page in a web browser you can play the entire game for free.

>>> Get the game on a real cartridge at Ferrante Crafts. <<<

Playing the web version

Click on the embedded player to enable sound.

Hardware requirements

  • To run on original hardware, the .gbc ROM file needs to go on a cartridge. There are no special requirements for cartridges; multi-game carts like the Everdrive GB and EZ Flash Junior will work, but so will any basic reflashable 32k cart.
  • You need a Game Boy Color, or compatible console (e.g. Game Boy Advance). A monochrome Game Boy (DMG, light, pocket) or Super Game Boy will not work.
  • The .pocket file runs directly from the SD card of an Analogue Pocket, with no cartridge required.


If you don't have a compatible console, you can still play the game using an emulator. Install a Game Boy Color emulator and use it to open the .gbc file. For best results, I recommend using SameBoy or bgb. Run in Game Boy Color mode.


Invasion of the Geminorons was playtested by Cian O'Carroll, Coffee "Valen" Bat, Geonjaha, Alphaknight, oshf, RedOctorok and YoshiTuk.

The music driver is hUGEDriver by Nick Faro.

The emulator used for the web version is binjgb by Ben Smith.

The game is built with GBDK-2020 and SDCC , and wouldn't have been possible without all of the people who contributed to those projects.

Míle Buíochas!

Rated 5.0 out of 5 stars
(5 total ratings)
Tags2D, 8-Bit, Aliens, Game Boy, Game Boy ROM, Homebrew, Pixel Art, Retro, Sci-fi, Turn-based
Average sessionAbout a half-hour
InputsKeyboard, Gamepad (any)
AccessibilityColor-blind friendly


Buy Now$4.00 USD or more

In order to download this game you must purchase it at or above the minimum price of $4 USD. You will get access to the following files:

geminorons.gbc 32 kB
geminorons.pocket 32 kB
manual.pdf 1 MB


Log in with to leave a comment.

The graphics are masterful. I love the DMA? on the title screen. It makes it look extra colorful



I made a diagram showing exactly how the title screen works:

Basically, it's using a single four-colour palette for the whole screen, but the colours in the palette get updated as the screen is rendering. So the art uses one colour for the background and one for the logo text, but you end up seeing two vertical gradients on screen.

Show post...

Make a Free Version

Show post...

Will it work on GB DMG?

No, it only works on Game Boy Color (and later compatible consoles). It won't work on earlier models like the original Game Boy, Game Boy Pocket, Game Boy Light, or Super Game Boy.

Show post...

Make a Demo

There's actually a web version, but it doesn't seem to display in the app.

If you visit the game page through the website, you can play the full game for free in your browser.

Does it support multiplayer?

No, the only game mode is player vs. CPU. The HTML5 version on the web has all the same features as the .gbc ROM file.