Game Design Document (GDD) – [RNK]

Table of Contents

1. Game Overview
2. Core Gameplay
3. Game World & Level Structure
4. Goblin Behavior
5. Boosters
6. User Interface & Navigation
7. Store & Progression
8. Level Generation & Difficulty Scaling

---

Game Overview

• Genre: Endless Runner with Squad Mechanics
• Platform: Mobile (iOS, Android)
• Art Style: 3D, colorful, medieval-fantasy theme
• Game Loop:
  1. Navigate the 3D menu world to access different sections (Store, Bank, etc.).
  2. Press Play → the camera rotates behind the player, and the run begins.
  3. Dodge traps, collect coins, fight goblins, and grow your squad while progressing.
  4. Rescue units to maintain squad size.

---

Core Gameplay

• Controls:
  • Swipe left/right – Moves the entire squad left or right (smooth X-axis movement).
  • The player cannot jump or slide (since the squad consists of multiple units).
• Main Objectives:
  • Avoid traps to prevent unit loss.
  • Collect coins and boosters for advantages.
  • Enter goblin camps to fight, rescue units, and progress further.
  • If the player has no units left and collides with a goblin, they die.

---

Game World & Level Structure

The game world is procedurally generated with randomly spawned locations.

• Long Locations
  • Focus on avoiding traps and collecting coins.
  • Losing units in traps reduces the player's squad.
• Short Locations (Goblin Camps)
  • Players must fight goblins using their units.
  • Free new units from cages to restore squad size.
  • If the player has no units left, they will die if they hit a goblin.

---

Goblin Behavior

• Goblins only appear in camps, which also contain cages and props that can be destroyed for visual effects.
• If the player has more than one unit, the front unit automatically attacks goblins and both are removed from play (unit dies, goblin dies).
• If the player has only one unit left, it won't attack. The player must either:
  • Rescue new units from cages before reaching the goblins.
  • Avoid goblins completely (if possible).
• If the player collides with a goblin while alone, they lose the game.

---

Boosters

Boosters replace some coin spawns and provide temporary benefits:

1. Jumper – Makes the group jump over obstacles, skipping a short section of the level.
2. Score Booster – Increases score multiplier and boosts speed.
3. Magnet – Attracts nearby coins to the player's units.

---

User Interface & Navigation

• 3D Menu System (No traditional UI screens)
  • All menu sections exist in 3D space inside a friendly camp.
  • The camera smoothly rotates to different sections instead of using loading screens.
  • Example: Selecting the store moves the camera to a golden treasure chest in the camp.
• Seamless Transition into Gameplay
  • Pressing Play rotates the camera behind the player.
  • The player starts running from the menu position, smoothly transitioning into gameplay.

---

Store & Progression

• How Players Earn Coins:
  • During runs – Collecting coins along the road.
  • Daily Bonus in the Menu – Free coins given daily.
• What Coins Are Used For:
  • Upgrading Boosters – Making them last longer or work better.
  • Buying New Skins – Customizing character appearance.
  • Unlocking New Playable Characters – Getting unique heroes.

---

Level Generation & Difficulty Scaling

• Random Level Part Sequence
  • Levels spawn in a random order, but ensure that all unique level parts appear at least once per cycle before repeating.
• Trap Activation Control
  • If a trap was disabled in the last sequence, the system tries to enable a different trap in the next one.
  • This prevents repetitive patterns and keeps gameplay fresh.
• Difficulty Scaling Over Time
  • Speed Increases – The player moves faster the longer they survive.
  • Trap Speed Increases – Traps animate and reset more quickly.
  • More Reaction-Based Gameplay – Faster speeds make dodging and squad management harder.

---