for Sega Master System

It is the 33rd century. Humanity continues its colonisation of the Red Planet, Mars. Colonists and miners have worked tirelessly for many years, excavating caverns of unimaginable scope throughout the core of the planet in search of elusive subterranean minerals.

This devastating work is viewed with contempt by many fringe groups in colonised space. Private security and intelligence forces are stretched to breaking point protecting those trying to tame the Red Planet.

Admist all this madness, a terrorist cell takes a number of key colonisation personnel hostage. Their demand: the absolute abandonment of Mars by the human race within twenty-four Earth hours.

The security forces deal with the immediate threat after a bloody and protracted siege... but, with his final words, the leader of the cell leaves a chilling warning...

"We have planted a nuclear device in the heart of Mars. A device capable of annihilating the entire planet."

This is where you come in.

You are an ace pilot. The best. Your trusty ship, the Greenwing, is equipped with a state of the art Gravity Beamô, capable of hauling any cargo through the most treacherous terrain.

With only minutes before the bomb detonates, you fly directly into the caverns of Mars... you've never had to carry a nuclear bomb before, but how dangerous can it be?

About

Gravity Beam: Master Gaiden is a new game for the Sega Master System.

Your mission:

At the end of the level, you're ranked on the time it took you to deliver the box. Deliver the box in less time to earn a better rank.

Winners save the planet!

Downloads

Gravity Beam: Master Gaiden
.SMS Image
(v1.01)

Size: 185 kByte.

Updated: 3rd May 2013.

Gravity Beam: Master Gaiden for your Sega Master System!

Gravity Beam: Master Gaiden
Source Code, Tools and Documentation
(v1.01)

Size: 700 kByte.

Updated: 3rd May 2013.

The complete source code to Gravity Beam: Master Gaiden.

You can also download either low-resolution or high-resolution (190 d-p-cm) images of the Gravity Beam: Master Gaiden Sega Master System case inlay!

News

3rd May 2013,

Welcome back, pilots!

Gravity Beam: Master Gaiden is now ready to download!

Gravity Beam: Master Gaiden was awarded 1st place in the SMSPOWER Coding Competition 2013, with a score of 8.43! Hooray!

If you have any questions or problems with the game, please e-mail me at the address shown in the Contact link.

Screenshots

Hints and Tips

Move slowly: the bomb is fragile!

Allowing the bomb to collide with the cave walls will damage it! When the box starts blinking, you know you're in trouble. The box will blink faster the more it is damaged. If the bomb incurs enough damage, it will explode!

Even getting it caught on something may be enough to destroy it. If the box gets stuck, detach from it immediately!

Remember your mission: don't place the box on the landing pad! We don't want it!! You have to drag it out into space. To do this, fly your ship out of the caves through the opening at the top of the screen near the starting position while the Gravity Beam is engaged.

The Gravity Beam has a maximum distance before engagement. You can only engage the beam if you're within about four ships' length of the box.

The Gravity Beam has a maximum length during engagement. If the box swings too far away from your ship, the Gravity Beam will be disabled and the box will go flying across the landscape.

The box is pretty heavy; if you're moving at speed and you make a sharp turn, the box might drag you into danger!

Your ship is indestructible, as are the cave walls. Colliding with the walls brings your ship to a dead stop. Use this to your advantage.

The box falls rather slowly through open space.

While you're attached to the box, you will see a dotted line between the Greenwing and the box.

Credits

Game design and programming by Mathew Carr.

Music and sound design by Mathew Carr.

Graphics by Mathew Carr.

Compression tools by Mathew Carr.

Music and sfx player and module conversion tools by Mathew Carr.

Additional maths routines detailed in maths.z80asm

Cover planning by Mathew Carr.

Cover Greenwing illustration by Jonathon Carr.

Tiled Map Editor (mapeditor.org) was used to create the levels.

Written in Z80 assembler.

Assembled using WLA Z80 Macro Assembler v9.5, written by Ville Helin.

Linked using WLALINK Z80 WLA Macro Assembler Linker v5.7, written by Ville Helin.

Custom tools synthesized from the luminiferous aether as per requirement.

Many thanks go to the denizens of SMS Power, without whom this game would not have been possible.

Emulators used:

Contact

Hello, my name is Mathew Carr!

You may have used my Objection! website, read my game reviews, played the original Gravity Beam for Amiga 500, or played my earlier games Lemmings DS or Blast Arena Advance or be lucky enough to own one of the very few real BAA Game Boy Advance cartridges!

You can e-mail me at matt@mrdictionary.net.

Licence

Gravity Beam: Master Gaiden, Copyright (c) 2013 Mathew Carr

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

* Neither the name of the author nor the names of the contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.