Alien Breed: Tower Assault
Encyclopedia
Alien Breed: Tower Assault (sometimes ABTA) is the third game in the Alien Breed
Alien Breed
Alien Breed is the first in a series of science fiction computer games played in the form of a top-down shooter for one or two players. It was released in 1991 by Team17 for the Commodore Amiga and later in 1993 by MicroLeague for MS-DOS.-Gameplay:...

franchise, a series of science fiction
Science fiction
Science fiction is a genre of fiction dealing with imaginary but more or less plausible content such as future settings, futuristic science and technology, space travel, aliens, and paranormal abilities...

-themed top-down shooters. It was released in 1994 by Team17 for the Amiga, PC and CD32, and is the last 2D game in the series.

Setting

A deep space barracks receives a distress signal from a science facility on an otherwise uninhabited planet. With no idea what to expect, a small troop of soldiers are sent to search the planet for survivors and neutralize any threat.

Once the ships near the facility, however, automated security lasers begin attacking, picking the ships off one by one. Only two soldiers survive, crash-landing in the outer perimeter of the facility. The player takes control of the characters there as the game begins.

Gameplay

The game engine is a modified version of that used in Alien Breed II: The Horror Continues
Alien Breed II: The Horror Continues
Alien Breed II: The Horror Continues is the sequel to Alien Breed, a Science Fiction-themed top-down shooter largely inspired by the Alien films. It was released in 1993 by Team17 for the Amiga, available in both OCS/ECS and AGA versions...

. One significant change is the inclusion of multiple exits for each level, making ABTA much less linear than its predecessors - the blurb
Blurb
A blurb is a short summary or some words of praise accompanying a creative work, usually used on books without giving away any details, that is usually referring to the words on the back of the book jacket but also commonly seen on DVD and video cases, web portals, and news websites.- History :The...

 on the back of the box boasts more than 276 possible ways of completing the game.

Other improvements include Retreat Mode, which allows the player to shoot their weapon and walk backwards at the same time, although at a slightly slower speed.

Format variations

There are significant differences between the versions of the game released across different formats.

Amiga version

The Amiga version contains the full game spread across three 3.5" floppy disks in original protected form (Disks are RobNorthen PDOS protected, each disk using longtracks + 980kb per disk) while the cracked version in amigaDOS
AmigaDOS
AmigaDOS is the disk operating system of the AmigaOS, which includes file systems, file and directory manipulation, the command-line interface, and file redirection....

 disk standard is spread over four disks.

CD32 version

This version of the game was supplied on a single CD, which contained the entire game preceded by a lengthy FMV
FMV
FMV may refer to:*Full motion video, Video sequences in computer games and video games*Fair market value, an estimate of the market value of a property*For Maximum Value , Kroger supermarket's store brand...

 intro sequence, which was relatively unusual for the time. The full AGA version of Alien Breed II: The Horror Continues
Alien Breed II: The Horror Continues
Alien Breed II: The Horror Continues is the sequel to Alien Breed, a Science Fiction-themed top-down shooter largely inspired by the Alien films. It was released in 1993 by Team17 for the Amiga, available in both OCS/ECS and AGA versions...

is also bundled on the CD.

PC version

There were two versions of Tower Assault for the PC, a floppy version and a CD-ROM version. Both were ported by East Point Software
East Point Software
East Point Software Ltd., also known as Promethean Designs Ltd., is the software development company for Aqua GT on the SEGA Dreamcast.-Games:*Adventures of Tintin, The: Prisoners of the Sun*Alien Breed: Tower Assault*Alien Breed 3D II: The Killing Grounds...

.

In the floppy version, many of the levels are omitted, as is the non-linear gameplay of the Amiga versions. Instead, a fixed set of levels are featured.

The CD-ROM version, however, retained the non-linear level structure as well as the FMV intro and outro sequences from the CD32 version. Although the packaging states Alien Breed II is also included, this is incorrect.
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