Game Design Document For “CO-OP 2D/3D Sibling RPG”

Written By Joel DuChesne

Table of Contents

Overview

Core Pillars

Gameplay Mechanics:

  • Cooperative Gameplay

  • Exploration

  • Combat

  • Puzzle solving

  • Character Progression

  • Character Leveling

  • Level Design

Story:

  • Story arc

  • Underlying story

  • Brother-Sister love

Narrative

Setting:

  • World building

  • Npc character creation

Art Style

Cooperative Gameplay

Weapons

Camera

Enemies

Dialogue

Items

Healing

Damage Systems

Character Abilities

Platforms 

Controls

AI

Target Audience

UI/UX

Music and Sound

Similar Games and Genres

Development

Milestones

End Game

Future Plans

Title: Siblings of Revenhai

**Overview:**

"Siblings of Revenhai" is a story-driven cooperative game set in a magical fantasy world. Players take on the roles of a brother and sister duo, each with unique abilities, as they embark on a quest to save their kingdom from an ancient evil. Blending elements of 2D and 3D gameplay, the game offers a captivating narrative, challenging puzzles, and exciting combat encounters.

**Gameplay Mechanics:**

  • **Cooperative Gameplay:**

    • Players control the brother and sister characters simultaneously, working together to overcome obstacles and solve puzzles.

    • Each character has distinct abilities that complement each other, encouraging strategic cooperation.

  • **Exploration:**

    • Players navigate through diverse environments ranging from lush forests to treacherous dungeons.

    • Discover hidden secrets, collect artifacts, and uncover the lore of the world.

  • **Combat:**

    • Engage in real-time combat encounters against a variety of fantastical creatures and minions of darkness.

    •  Utilize each character's unique combat skills and magic abilities to defeat enemies.

  • **Puzzle Solving:**

    •  Encounter intricate puzzles that require cooperation and critical thinking to solve.

    • Combine the siblings' abilities to manipulate the environment, unlock passages, and progress through the game.

  • **Character Progression:**

    • Earn experience points and level up to unlock new abilities and upgrades for both characters.

    • Characters will not have a skill tree system

    • Your characters individually have their own builds, however the way you decide to build them out is solemnly up to you. Though keep in mind building your characters to compliment each other is a way to have a more sturdy gameplay experience. 

    • Characters will have the ability to also change their build at any given time with a certain item obtained when playing the game. (Like a seed of some sort or something. Meaning you have to have this item you find in your inventory to then use it to transfer your levels in whichever abilities you have in order to change your build.) 

**Story:**

The kingdom of ******* has been destroyed for years. An ancient evil that has awakened after centuries of slumber has risen to take over the lands. As the siblings of the royal family, the brother and sister must embark on a perilous journey to gather powerful artifacts scattered across the land. Along the way, they must uncover the truth behind the darkness threatening their world and ultimately confront the source of the malevolent force.Along the way the Brother and Sister encounter many friends and foes. The sister will find love with a stable boy whereas the brother has lost his will to love another after his young love was killed years prior. Instead the brother will find that he is the best warrior in the land alongside his sister. 

**Narrative**

**Setting:**

The world of ******* is a vibrant and magical realm filled with mystical creatures, ancient ruins, enchanted forests, dark dungeons,slippery swamps, frosted mountain tops and Enormous castles. From the towering spires of the capital city to the depths of forgotten catacombs, players will explore diverse landscapes rich in lore and wonder. The world is free to roam, with much to explore, making sure you're together for the entirety of it may be your best bet at survival and completion. 

**Art Style:**

The game features a visually stunning art style blending 2D hand-drawn environments with 3D character models and effects. Vibrant colors, detailed animations, and atmospheric lighting bring the world of Arcadia to life, immersing players in its fantastical atmosphere.

**Platform and Controls:**

"Siblings of *******" is designed for PC and console platforms. Players can control each character using a combination of keyboard and mouse or game controller inputs, providing intuitive and responsive gameplay.

**Target Audience:**

The game targets players who enjoy immersive storytelling, cooperative gameplay, and challenging puzzles in a fantasy setting. With its blend of 2D/3D mechanics and engaging narrative, "Siblings of Arcadia" appeals to both casual and hardcore gamers alike.

**Weapons**

  • Longsword

  • Battle axe

  • Warhammer

  • Spear

  • Halberd

  • Mace

  • Flail

  • Crossbow

  • Bow and arrow

  • Dagger

  • Poleaxe

  • Morningstar

  • Lance

  • War pick

  • Sword 

  • Catapult

  • Trebuchet

  • War scythe

  • Billhook

  • Bastard sword

  • Shield

 **Items**

  • Mana Potion: Replenishes magical energy or mana.

  • Potion of Invisibility: Grants the user temporary invisibility.

  • Potion of Strength: Temporarily enhances physical strength.

  • Potion of Speed: Increases the user's speed or agility for a short time.

  • Potion of Fire Resistance: Provides protection against fire damage.

  • Potion of Water Breathing: Allows the user to breathe underwater for a limited duration.

  • Potion of Poison Resistance: Grants immunity or resistance to poisons.

  • Potion of Fortitude: Increases resilience and endurance.

  • Potion of Clarity: Clears the mind and improves focus or mental acuity.

  • Potion of Luck: Bestows good fortune or increases the likelihood of favorable outcomes.

  • Potion of Transformation: Causes a physical or temporary transformation into another form.

  • Potion of Sleep: Induces sleep or relaxation.

  • Potion of Truth: Compels honesty in the drinker or reveals hidden truths.

  • Potion of Levitation: Allows the user to float or levitate above the ground.

  • Potion of Fertility: Aids in conception or fertility.

  • Potion of Youth: Slows down aging or rejuvenates the drinker.

  • Potion of Love: Creates feelings of affection or infatuation towards the imbiber.

  • Potion of Resurrection: Brings the dead back to life, often with limitations or consequences.

  • Elixir of Immortality: Grants eternal life or extreme longevity.

**Heals**

Healing Potion: Restores health and vitality. As your characters venture on throughout the story they will have opportunity to learn healing spells as well, depending on how they want to create their build.

**Puzzles**

These are a couple types of puzzles that could possibly be in the game, needing there to be a couple that at least fit the 2d/3d style.

  • **Logic Puzzles**: These require the player to use reasoning and deduction to solve, such as Sudoku or logic grid puzzles.

  • **Spatial Puzzles**: These involve manipulating objects or navigating environments in a three-dimensional space, like arranging blocks to fit into a specific shape or solving maze puzzles.

  • **Pattern Recognition Puzzles**: Players must identify and replicate patterns, such as repeating sequences or matching colors.

  • **Riddles and Clues**: These puzzles often involve deciphering cryptic messages or solving wordplay-based challenges to progress.

  • **Physics Puzzles**: These involve understanding and manipulating the in-game physics to achieve a goal, such as using momentum or gravity to move objects.

  • **Inventory Puzzles**: Players must collect and utilize items found in the game world to overcome obstacles or unlock new areas.

  • **Environmental Puzzles**: These are integrated into the game environment itself, requiring players to interact with elements in the surroundings to progress.

  • **Timing and Reflex Challenges**: These puzzles require precise timing or quick reflexes to complete, such as dodging obstacles or pressing buttons in a specific sequence.

  • **Memory Puzzles**: Players must remember information provided earlier in the game or recall patterns they've encountered to progress.

  • **Combination Lock Puzzles**: These involve discovering and inputting the correct combination of numbers, symbols, or colors to unlock doors, chests, or other objects.

  • **Sequence Puzzles**: Players must arrange elements or perform actions in a specific order to solve the puzzle.

  • **Music or Sound-based Puzzles**: These involve using auditory clues or interacting with musical elements to progress.

Joel DuChesne
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