1. Breach Game Design Document
Breach
Game Design Document
Version 1.0
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2. Breach Game Design Document
High Concept
The year is 2117, mankind has made a breakthrough in the form of a new element on the periodic table
given the name Excidiem. After preliminary testing of the element it was shown to be the perfect
candidate for a clean energy source, mankind’s new fuel. An experimental Excidiem reactor was
constructed and soon after completed with help from a coalition of scientists and contractors. The day
came when the reactor was brought online. No one could have predicted what happened next. The
Excidiem became unstable, impure and with it began to multiply at an alarming rate, turning whatever it
touched into part of itself, part of the hive.
That was 6 years ago, it’s now 2123 and mankind now abandons a planet covered in Excidiem life forms.
After the reactor meltdown it was found that Excidiem is only controllable in zero gravity with the help
of the absolute isolation system (A.I.S.) to guard against impurities that might enter the Excidiem power
core. As the defensive AI for the Excidiem core this task falls to you.
All systems operational…
Linear rail online…
Ready to begin…
Gameplay
The game begins within a sterile white sphere with rails lining each axis with a cube in the middle made
of several smaller cubes. The massive center cube floats within the center and houses a sphere within
that must be protected at all costs. Enemies will appear within the sphere and by pressing the 1-6 keys
the player may move along the rails going from side to side protecting the cube that houses the
Excidiem core. In addition to moving the left mouse button may be used to fire the quantum laser
turret and the right mouse may be used to freeze enemies in position. Powerups will appear during the
defense of the Excidiem core that may be used with the Z key or cycled through using the W & S keys.
Level progression will occur every few minutes the core is kept intact until the Excidiem within becomes
unstable, and explodes. In addition to temporary powerups new weapons may be awarded to the
player based on certain achievements in the form of defeating so many of a certain enemy type or using
certain powerups so many times. These turret modifications will be interchangeable using the A or D
keys to cycle through them.
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Player Objective
Primary objective: Protect the Excidiem core for as long as possible.
• Tutorial 1: Movement training
• Tutorial 2: Fire training
• Tutorial 3: Temporal hold
Core Gameplay Mechanics
Player Abilities
• Stationary position with camera switching ability
• Fire Quantum Laser
• Temporal Hold
Enemy Abilities
• Free movement
• Core attack
• Illusions (certain types)
• High defense (certain types)
• High speed (certain types)
Camera
The camera will be a first person view through the camera lens of an A.I.S turret used for defending the
Excidiem core.
Controls
Breach will mainly feature keyboard controls but can also be mapped to an Xbox 360 controller. When
using the keyboard the HUD will show the numbers 1-6 representing the sides. When using a controller
the HUD will show a small cube. When under attack the numbers will blink or the side will blink within
the HUD to help the player pinpoint attacks.
Action Keyboard Controller
X Axis movement 1, 2, 3, 4 Left/Right D-pad
Y Axis movement 5, 6 Up/Down D-pad
Camera movement Mouse Right thumbstick
Fire quantum laser Left mouse Right trigger
Temporal hold Right mouse Left trigger
Turret ability cycle A/D Right bumper
Power-up cycle W/S Left bumper
Turret ability select Q X
Power-up select Z B
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Enemies
Nano-Class Contagion
Stat/Ability Details
Health 10hp
Weakness Basic weapon
Abilities none
Flight Speed 1
Size Small
Strength 20
Striker-Class Contagion
Stat/Ability Details
Health 10hp
Weakness Temporal Hold
Abilities Invulnerable unless temporal hold used
Flight Speed 3
Size Small
Strength 30
Alpha-Class Contagion
Stat/Ability Details
Health 50hp
Weakness Basic weapon
Abilities Able to strike multiple cubes at once.
Flight Speed 2
Size Average
Strength 50
Phantom-Class Contagion
Stat/Ability Details
Health 100hp
Weakness Basic weapon
Abilities Phase: Invisibility & invulnerability to bullets
Flight Speed 4
Size Average
Strength 40
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5. Breach Game Design Document
Void-Class Contagion
Stat/Ability Details
Health 100hp
Weakness Basic weapon
Abilities EMP: Temporarily blind the player
Flight Speed 3
Size Large
Strength 70
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6. Breach Game Design Document
Items
Collectible items the player can use are divided into two categories. Upgrades automatically become
available under certain conditions and can be used from then onward. Power-ups are one time use
abilities that appear randomly and will not have a chance at reappearing until they are used.
Upgrades
Name Ability Condition to unlock
Lock-on Lock-on to enemies Kill 75 enemies
Temporal Lock Enemies remain held for 3
seconds after temporal hold has
been released.
Temporal hold 50 enemies
Barrier Repair Able to repair cubes before they
break.
Destroy 20 of each enemy class.
Frost Shot Temporarily slow enemies while
dealing damage.
Destroy 50 Striker-class
enemies.
Charge shot Hold fire button to charge
power.
Destroy 50 Alpha-class enemies.
Multi Shell Fire a shotgun-style spray Destroy 50 Void-class enemies.
Burst shot Fires in 3 round bursts Destroy 50 Nano-class enemies.
Power-ups
Name Ability Chance to appear every:
Linear Accelerator Slows down all enemies for 20
seconds.
60-120 seconds
System Lockout Barrier invulnerability for 10
seconds.
90-180 seconds
Core Purge Destroy all spawned enemies. 180-300 seconds
Barrier Restore Repair all damage on current
side.
60-300 seconds
Quantum assist Target all enemies on current
side simultaneously for 15
seconds.
120-300 seconds
Quantum restoration Completely restores barrier to
full health on all sides.
300 seconds
Ion cannon The quantum laser turns to an
ion cannon, burning any enemy
it touches for 10 seconds.
60-120 seconds
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Assets
Name Description File Type Complete
Art Title screen Title background Yes
Menu screen Menu screen Yes
Barrier cube 3-d barrier cube Yes
Nano enemy Nano-class enemy No
Striker enemy Striker-class enemy No
Alpha enemy Alpha-class enemy No
Phantom enemy Phantom-class
enemy
No
Void enemy Void-class enemy No
Accelerator
powerup
Accelerator
powerup
No
System lockout Lockout powerup No
Core purge Core purge
powerup
No
Barrier restore Barrier restore
powerup
No
Quantum assist Assist powerup No
Quantum
restoration
Restoration
powerup
No
Ion cannon Cannon powerup No
HUD Lock-on Lock icon No
HUD Crosshair Crosshair Yes
HUD Warning
cube
Xbox controller
HUD cube
No
Contamination
meter
Excidiem health bar Yes
Bullet Bullet Yes
Frost bullet Frost bullet No
Charge bullet Charge bullet No
Inner core sphere Inner sphere for
Excidiem
No
Outer sphere Background of
sphere and rails
No
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Name Description File Type Complete
Audio Title screen BGM Title background
BGM
No
Menu screen
BGM
Menu screen BGM No
Menu select SFX Menu select Yes
Menu confirm SFX Confirmation SFX Yes
Shoot SFX Shooting SFX No
Lock tone SFX Lock tone SFX No
Charge SFX Charge SFX No
Kill SFX Kill SFX No
Stage 1 BGM Stage 1 BGM Yes
Game over BGM Game over BGM No
Upgrade unlocked Upgrade message
SFX
No
Side health low Health warnings Yes
Core
contamination
Contamination
warning SFX
Yes
Powerup SFX Powerup SFX Yes
Powerup used SFX Use powerup SFX Yes
Explosion SFX Explosion of core No
Name Description File Type Complete
Design Design Document Contains details of
the game
No
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