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Eternal is one of the largest scenarios ever created for Aleph One, initially created by Forrest Cameranesi (Pfhorrest) and subsequently revised and expanded by a massive team known as the Xeventh Project, which, as of this update (March 2024) now includes more than 40 people. Besides Tempus Irae, it may be the oldest scenario still being actively developed; it was first released in 2004 and has been refined and expanded almost continuously ever since. Features include, but are hardly limited to:

• 52 levels, some revisiting familiar locations from the Marathon trilogy and some being among the largest ever created for the engine
• An intricately layered plot featuring dense political and philosophical themes, a tragic romance, time travel, major events from the Marathon trilogy’s backstory, complex original characters, and returning faces from the trilogy’s cast
• A huge, acclaimed soundtrack with unique music for every level, lasting more than seven hours total, and created by over a dozen composers and arrangers (significantly expanded in 1.3 previews 4 through 6)
• Redesigns of most of the game’s familiar cast (new in 1.3), some old foes from Pathways into Darkness, and some new faces (some new in 1.3)
• Hundreds of gorgeous terminal images (many added for 1.3 preview 4 through 6)
• Five texture sets, encompassing 650 high-resolution textures, 12 detailed original landscape textures, and several separate human and alien environments
• An in-game menu system (new in 1.3 preview 6) that toggles several optional features, including:
  • Simplified overhead map views in around twenty levels (new in 1.3 preview 6)
  • A secret tracking system (new in 1.3 preview 4)
  • Auto-save the game on level transition (new in 1.3)
  • An RPG-style monster health display (new in 1.3 preview 6)
  • Shared pickups between players in network games (new in 1.3 preview 6)
  • Disabled friendly fire between players in network games (new in 1.3 preview 6)
• More than 360 sounds, remixed or remastered in CD quality, in stereo where possible (new in 1.3)
• Atmospheric weather like rain and snow (new in 1.3)
• A final boss battle of sorts (new in 1.3)
• Detailed documentation including illustrated field guides to Eternal’s weaponry, aliens, and humans, detailed credits, a meta-history of Eternal, and technical notes on how its maps and scripts work (new in 1.3)

The current development release, 1.3 preview 6 (released on 2024-03-07), is perfectly playable despite still being incomplete; it is now our recommended way to play the game. We’ll refrain from estimating the release date of 1.3 final, as we’ve overshot too many estimates to count (thank you, feature creep). The current “stable” build, 1.2.1 (released on 2021-11-07), is missing several features listed above but is still an enjoyable game in its own right.

The screenshots seen on the right are from a development release from between 1.3 previews 4 and 5 and are a reasonable reflection of Eternal’s current appearance. Although they were taken on Normal (so as to show more monster types), we do recommend playing Eternal on the highest difficulty you can manage.

Notes for version 1.3 preview 6:

Current development release. 1.3 incorporates several new features, many detailed above. New in 1.3 preview 6:

• Hard requirement of Aleph One 1.7 or later.
• An in-game menu system that toggles a ton of new optional scripts (a huge thanks to Solra Bizna for the menu system), including:
  • Hide irrelevant layers of the overhead map (a massive aid to navigation).
  • RPG-style monster health display.
  • Disable friendly fire in cooperative games.
  • Shared item pickups in cooperative games.
• New drone and Juggernaut sprites in chapter four. (A huge thanks to General-RADIX for these.)
• Fixes to dozens of physics inconsistencies. (A huge thanks to Irons for his help with this.)
• Major music changes:
  • Every level now has at least one unique music track.
  • “We Met Once in the Garden” now uses multiple tracks that shift depending on in-game events, à la FTL or Cadence of Hyrule – to our knowledge, this is the first scenario to make use of Aleph One 1.7’s dynamic music features, though in a relatively simple fashion.
  • Seventeen of Craig Hardgrove’s tracks have been newly remastered or remixed from newly available, much higher-quality sources, some multiple times.
  • The game soundtrack is now encoded as Opus, the objectively best lossy music codec by every performance metric.
  • True obsessives may use an optional lossless FLAC version for the in-game soundtrack.
• New (or newly accessible) areas in “Deja Vu All Over Again”, “Roots and Radicals”, “Core Done Blew”, “A Friend in Need”, “Frog Blast the Vent Core”, and “I’ve Got a Bad Feeling About This”.

Additions to preview 5:

• Fixes to several major bugs, including crashes in six different levels, the HUD messing up in non-16:9 aspect ratios, and problems in network games with the secret counter and map overlay.
• Over an hour of new/updated music since preview 4.
• New secrets in a few levels.
• Jjaro sludge is no longer coloured like M1’s toxic Pfhor goo.

2,441 downloads, 2 reviews, 5 screenshots, 5.0 rating

A cool scenario from 1997 by one Christian Blomqvist. Take on some rascally no good 'Gangsterz'. Featuring all new sprites and enemies. This is one not to miss!

1,668 downloads, 0 reviews, 3 screenshots

This is a full port of the 1993 mac game "Pathways Into Darkness" by Bungie to the Aleph One engine. Therefore, Pathways into Darkness is now available on Windows, Linux, and Mac.

Note: You must use version 1.7 of AlephOne or newer. Download here: https://alephone.lhowon.org/download.html.

This is a little different from a typical marathon scenario, as it features:

• Levels that can be re-visited multiple times with their state preserved.
• Advanced inventory for carrying and using many items.
• Resting to heal.
• Use of crystals to use special powers, along with conventional weapons.
• RPG elements.
• An ending score based on how you do while playing the game.
• Talking to the dead.

Make sure to read the readme for important information about controls. There are some non-obvious things you need to be aware of when playing the game. If you get stuck, there is a link to some Youtube videos in the readme that can be used as a guide.

Notes for version 1.4:

• Updated fog to work with the new version of Aleph One.
• Can now go back to the menu by clicking on the score screen after a delay.

14,485 downloads, 7 reviews, 9 screenshots, 4.7 rating

Apotheosis X is a total conversion featuring 24 massive levels of carnage brought to life with entirely reimagined sprites and textures, high frame rate animations, 16 bit audio and an original soundtrack.

The campaign features engaging combat that scales with player skill and aggression, with a roster of new enemies and weaponry that complements the original games' nuance and high skill ceiling.

Notes for version 1.1:

Key updates for 1.1:

• Sound effects are louder and punchier, with more variety.
• The player's arsenal is more powerful, with many adjustments that make it more effective on total carnage.
• Additional saves, items and resources throughout the campaign.
• Weapon and item pickups are more visible.
• Numerous bug fixes, including the removal of 2 soft locks.
• Numerous small updates to level designs.
• Included PDF manual with a weapon manifest and additional backstory.

An extensive list of updates is available in the download.

8,389 downloads, 14 reviews, 13 screenshots, 4.4 rating

Marathon 1984 is a custom 3 map scenario for Marathon Infinity, created in 1997 by Frank 'Elk' Rooke and distributed in the MacAddict issue No. 13 cover CD.

This file contains the Marathon 1984 map file and a patched shapes file in MacBinary II format, compatible with Aleph One, as well as the original installer for classic MacOS also in MacBinary II format.

Contents of the Marathon 1984 original readme file:

Marathon-1984 Scenario

Level construction, textures and terminal art: Frank 'Elk' Rooke Many thanks to Devon Belcher (UESC Marine terminal pict by Devon)

Final merge: 6-16-97

1984 consists of three levels to be played as solo maps only and using Marathon Infinity.

Send your comments or questions to: kfrooke@earthlink.net.

1,495 downloads, 1 review, 7 screenshots, 4.0 rating

This is a 30 level scenario that truly deserves official sequel status to the original Marathon trilogy. We're so confident about that, that we're calling it Marathon 4. There are too many people that helped with this project that it's impossible to name everyone. Thank you all fans of marathon!

This scenario is truly groundbreaking in that every time you play the game, your experience will be different. No two players will ever have the same experience playing through this game. The replayability is endless!

1,987 downloads, 6 reviews, 0 screenshots, 4.2 rating

Dissent scenario by Thomas Reed. Modified for Aleph One by Mark (no last name).

Website

Notes for version v1.2:

from the readme:

Users must have Aleph One 0.16 or higher. "Marathon Dissent.bin" in the read me folder can be decoded (.bin file) and used with the the decoded (.bin) Image and Map files in classic. The look and feel of the game should be the same. The mml scripts are for text strings and opengl code.

1,688 downloads, 2 reviews, 3 screenshots, 3.0 rating

This is the latest release of this scenario.

Winter 1 is a collaborative single player project originally made in 2010 to succeed the Xmas series. It consists of 7 levels.

Contributors: Drictelt, Shadowbreaker, $lave, Axle_Gear

Notes for version 1.3:

This version is from 2022 and was packaged with modern tools, so it should work on every platform. It also has some other improvements:

• Created a new second level
• Bug fixes and changes to some of the monsters
• Various graphic changes

1,700 downloads, 1 review, 3 screenshots, 4.0 rating

A one-level scenario where the player must seek out and punch the seven pumpkin beacons while avoiding Shades, Wraiths, and the occasional Pfhor.

Includes plugin that must be enabled for scenario to work properly.

Volume Warning: screamer.

Notes for version 1.02:

Embedded Increased Dynamic Limits back to Aleph One 1.0 amounts.

Fixed glow mask artifacts with fire sprites.

3,420 downloads, 1 review, 2 screenshots, 3.0 rating

These are compatibility files for Wheels! (a marathon engine game) to make it work in Aleph One. If you happen to own Wheels!, you can combine it with these files to play it with Aleph One. The original game supported input devices for people learning to use a wheel chair, and I don't know if those work in Aleph One. You will be limited by whatever inputs it supports, so this is mostly just for people curious to go through the game outside the context of its original purpose.

1,903 downloads, 2 reviews, 1 screenshot, 3.0 rating

Archive backup of the partial conversion scenario Pfh'Joueur for Marathon Infinity, converted to an Aleph One compatible unimap format. Originally at Fileball.

Scenario readme:

Welcome to Pfh'Joueur by Candace Sherriff, Gareth Wood and Rainer Udelhoven. Playing Pfh' Joueur with Aleph One:

Copy the Aleph One (0.16 or higher) application or exe into the Arx Immanis folder.

Unimap Notes

Users must have Aleph One 0.16 or higher. "Pfh' Joueur Classic" can be decoded (.bin file) and used with the the decoded (.bin) Image and Map files in classic. The look and feel of the game should be the same. The mml scripts are for text strings and opengl code.

Any unimap problems email

ahuxley@adelaide.on.net

Thanks Mark

2,073 downloads, 0 reviews, 10 screenshots

The Map file for Marathon 2: Durandal, as it was presented in the Windows 95 release.

The Windows map file contains several visual (and a few gameplay altering) changes from the Mac version, many small, some big. It also has a few altered terminal images.

Anyone familiar with "Waterloo Waterpark" will immediately be surprised with this rendition.

There are some players who do prefer the Windows map, so I decided it would be worth posting on Simplici7y.

The M2 Win95 map file is not particularly hard to obtain, as it is available in retail M2 copies for Windows, and it's available as a download on the Trilogy Release site, HOWEVER, that merge does not contain chapter screen sound effects. I re-merged the map file with the Mac version's sound resource folder, so now all chapter screens will play the appropriate sound.

2,074 downloads, 2 reviews, 3 screenshots, 3.0 rating

"An enormous 6-level total conversion. (Well, okay, not total... and that's its biggest weakness.) The mapmaking is pretty good, and the new creatures are quite cool (you can see them in a series of very nice pics here if you're up for a 3 meg download, or get an idea from this 500K desktop picture), but I was bugged a bit when a new monster, with lots of new looks/sounds, died with an old sound, or fired with an old sound, or... Okay, it's a trivial complaint. Overall, this is really, really well done. It's been out for a while (as have lots of the recent uploads), but it's the first time I've seen it, and maybe you, too. Lots of art, lots of sound, lots of music (that's where all the new size comes from)."

Created by Marcos T. Pinheiro - 1/30/99

2,185 downloads, 1 review, 4 screenshots, 4.0 rating

It is 40 years after the combined forces of Earth and the S'pht Kr sacked the Pfhor system. You were put back into stasis after your legendary battles at Tau Ceti and L'howon. You've been recalled from stasis to help the UESC on a mission of utmost importance. You are aboard the UESC Leviathan and headed towards the Kolana system. Hobbes, the onboard AI, informs you of the situation. The Pfhor are back. So are the S'pht. More importantly, there is a new player in town, an AI called Wanda.

Features:

• An epic 3-way battle for the Jjaro AI with fluid alliances. Fight with the S'pht against the Pfhor, fight with the Pfhor against the S'pht. Fight alone against everyone.
• A new texture set
• 12 solo levels

Created by John A. Hancock, 1998

2,140 downloads, 1 review, 4 screenshots, 3.0 rating

Here it is, at last: Marathon TROJAN. Now compatible with Aleph One (1.3 or newer), this uses the native M1 files to deliver the original, unaltered experience we know from the 90's.

M1 compatible fullscreen HUD plugins will work with TROJAN if you don't want to use the included Classic HUD plugin.

Additional files include the Weapons Pump Patch, FAQ, Manual, Spoiler Guide, and read me's from older versions of TROJAN.

Special thank you to Hamish Sanderson for giving us permission to distribute this re-release of TROJAN. Enjoy!

Update 3/3/25 - You can also find a Trojan standalone edition here https://hhas01.itch.io/trojan-se

"James’ Trojan AO scenario (2020) is a highly faithful warts-n-all port of the original M1 Trojan. This was important for historical preservation of early Marathon history, but not a great gameplay experience itself.

Trojan Standalone Edition (2021) made numerous fixes and enhancements to James’ scenario and customizations to the engine code. That’s why it’s released as Standalone Edition, not an add-on."

5,476 downloads, 5 reviews, 5 screenshots, 3.6 rating

Portal of Sigma is an Aleph One scenario with a new story, landscapes, textures, weapons, and updated sprites.

I've repackaged it and fixed a few things with the MML to make everything work with modern Aleph One. -Shappie

Credits

Simon Dupuis, Chris Wheeldon, Andrew Cormier, Rony Sanchez, Goran Svensson, Alex Bolton, Mike Finley, Scott Noblitt, Alex Dupuis

2,557 downloads, 3 reviews, 3 screenshots, 2.3 rating

"What a hoot! If you enjoyed revisiting Earth in Tempus Irae, you're going to really like your "Vacation In Vilcabamba". The mapmaking is excellent and more than sufficiently puzzly, the new textures are gorgeous, the terminals are completely proof-read, the AI is moderately twisted, and the monster placement is quite good, with a new baddie for you to wrestle with. My only disappointment was that it was only one level; I finished it cheering for more." Description by Rigger

Created by Daniel Thomas

I have applied the old Mac patches and converted to files that modern Aleph One will read. Enjoy! -Shappie

2,330 downloads, 2 reviews, 3 screenshots, 4.0 rating

Phoenix Falling is a large M1 scenario of 44 levels featuring a new story with new characters, weapons, creatures, sounds, shapes, and more. (48 with secret levels and one network level)

Please keep in mind - there are bugs in this release. Most of these are caused by running the game in the Aleph One engine, which did not yet exist when the scenario was created. This used to be run with the original M1 engine.

Some of the largest known bugs are related to shapes not rendering correctly with chairs, tracer rounds from the brass gun, the weapon display in the HUD interface, and most of the new creature animations.

Repackaged for Simplici7y with permission from the Phoenix Falling creators, Matt & Andrew Schenk.

Notes for version 1.3:

This version has a fixed Map file that should allow terminals to function in the vacuum levels.

2,695 downloads, 3 reviews, 4 screenshots, 4.3 rating

"A 19-level solo masterpiece, with new sounds, shapes, terms, physics, bobs... and it's totally non-linear (you decide what order to do the levels in). Brought to you by the folks who did U.S.S. Raider, Athens Outpost, and the Marathon's Story page."

This scenario has been converted to an Aleph One compatible format and repackaged for Simplici7y.

2,557 downloads, 2 reviews, 4 screenshots, 3.0 rating

A 22 level single player game with brand new terminal art, weapons, environments, characters, and a story fleshing out the Marathon universe.

This scenario had become unattainable save for a single place, the Marathon Total Carnage Pack. I extracted and repackaged it to upload here, so everyone can access and enjoy this incredible scenario.

It is technically "unfinished" but only in the sense that it is missing some polish. It is essentially complete and you can play through the entire scenario without issue. Read the read me file for more information about Apotheosis.

Special thanks to Hypersleep.

2,712 downloads, 1 review, 3 screenshots, 5.0 rating