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Summary

Project: Sengoku Nexus

A Modern Single-File Grand Strategy Game Inspired by Nobunaga’s Ambition

Nobunaga’s Ambition is a historic turn-based strategy series created by Koei.

  • 1983: Original Japanese release on the PC-8801.
  • 1986: English IBM PC release and Nobunaga’s Ambition: Zenkokuban.
  • 1989: Nintendo Entertainment System (NES) release.

Players assume the role of a daimyo during Japan’s Sengoku (Warring States) period, balancing economics, agriculture, diplomacy, military expansion, and conquest to unify Japan.

Classic Gameplay

  • Setting: Sengoku Japan
  • Goal: Unify the country
  • Management: Gold, rice, peasant loyalty, flood control, troop training
  • Historical Scenarios: 1560, 1582, and similar starting years featuring different regional daimyos

TASK

Create a complete, playable grand strategy game as a single index.php file using only:

  • PHP (document shell only)
  • HTML5
  • Bootstrap 5
  • Vanilla JavaScript (ES6+)
  • SVG
  • HTML5 Canvas

Everything must exist inside one file, even if it becomes several thousand lines long.

SYSTEM DIRECTIVE

Project Codename

SENGOKU NEXUS

Generate a modern grand strategy game inspired by Nobunaga’s Ambition that introduces two major innovations:

  1. Officer-Driven Deckbuilding
  2. The Web of Grudges

The result should feel like:

Nobunaga’s Ambition × Crusader Kings × Slay the Spire

without copying any of them directly.

Technical Constraints

  • Output exactly ONE code block containing the complete index.php
  • Bootstrap 5 via CDN
  • Vanilla JavaScript (ES6+ classes)
  • HTML5 Canvas
  • SVG for the province map
  • Browser localStorage save/load
  • No React
  • No Vue
  • No Angular
  • No jQuery
  • No external image assets

Canvas graphics should use Unicode symbols such as:

  • ♞ Cavalry
  • ♙ Ashigaru
  • ⛫ Castle
  • :shinto_shrine: Shrine

Everything must be procedurally drawn.

Innovation A — Officer-Driven Deckbuilding

Instead of a static command menu:

Draft
Develop
Attack
Tax

actions come from Edict Cards.

Base Deck

Every daimyo begins with cards such as:

  • Basic Tax
  • Basic Draft
  • Develop Markets
  • Irrigation
  • Rice Relief
  • March
  • Hold Council

Officer Cards

Hiring officers permanently expands the deck.

Examples:

Ninja Master

Adds:

  • Assassinate
  • Sabotage
  • Night Raid
  • Smoke Bomb
  • Escape Route

Jesuit Missionary

Adds:

  • Import Matchlocks
  • Foreign Trade
  • Mission School
  • Volley Fire

Brilliant Engineer

Adds:

  • Rapid Fortress
  • Road Network
  • Supply Train
  • Peasant Genius

Seasonal Draw

Every season:

  1. Rebuild the dynamic deck
  2. Shuffle
  3. Draw 5 cards
  4. Gain 3–5 Command Seals
  5. Play cards until Command Seals are exhausted

Normally the player plays approximately:

  • 3 cards
  • occasionally 4
  • rarely 5

depending on leadership and bonuses.

Living Deck

Officer cards exist only while that officer serves you.

If an officer:

  • dies
  • defects
  • is imprisoned

their cards disappear from:

  • Draw pile
  • Hand
  • Discard pile
  • Future deck construction

immediately.

Innovation B — The Web of Grudges

Replace the traditional Loyalty stat.

Every officer tracks:

  • Bond with Daimyo
  • Grudge
  • Stress
  • Hidden Ambition

and maintains relationships with at least two other officers.

Examples:

  • Sworn Brother
  • Bitter Rival
  • Secret Lover
  • Mentor
  • Student
  • Family
  • Political Ally

Relationship Consequences

Examples:

Battle

Ordering an officer to attack his sworn brother may cause:

  • refusal
  • hesitation
  • mid-battle defection

Promotion

Promoting a low-born officer over proud samurai fills hidden Grudge meters.

Eventually those grudges create negative cards:

  • Resentful Murmurs
  • Treason
  • Conspiracy

which pollute the player’s deck.

Screen Layout

Use Bootstrap with d-none to swap fullscreen views.

Screen 1 — Start Screen

#screen-start

  • ASCII castle
  • :japanese_castle: SENGOKU NEXUS
  • New Game
  • Continue
  • Help

Screen 2 — Grand Strategy

#screen-map

Left (30%)

Player hand

Display five Edict Cards using Bootstrap cards.

Center (50%)

Interactive SVG map

  • 10 provinces
  • clickable polygons
  • color coded by clan

Right (20%)

Information panel

Contains:

  • Event log
  • Warnings
  • Relationship alerts
  • Balance of power

Screen 3 — Tactical Battle

#screen-tactical

Fullscreen Canvas battle.

Draw everything procedurally.

Data Models

class Card
{
    id
    name
    description
    cost
    effectFn()
}

class Officer
{
    id
    clanId

    stats:
        Leadership
        Valor
        Intelligence
        Politics

    cardsProvided

    relationships
}

class Province
{
    id
    ownerId

    wealth
    yield

    troops

    unrest

    fortification

    floodControl
}

Game Loop

One turn equals one season.

1. Draw Phase

  • rebuild deck
  • shuffle
  • draw five cards

2. Action Phase

Player:

  • plays cards
  • targets provinces
  • targets officers

Updates the UI immediately.

3. AI Phase

Each AI clan chooses actions using weighted decision making.

Possible actions:

  • Develop
  • Draft
  • Recruit
  • Attack
  • Diplomacy

4. Upkeep Phase

Autumn only.

Calculate:

  • Rice harvest
  • Flood control
  • Army upkeep

If rice becomes negative:

  • troops desert
  • unrest rises
  • loyalty falls

5. Event Phase

Evaluate:

  • Relationships
  • Grudges
  • Rivalries
  • Secret lovers
  • Ambitions

If Grudge exceeds 80:

Trigger:

  • rebellion
  • assassination
  • defection
  • civil war

Combat

Playing a March card opens the tactical battle screen.

Canvas:

Draw units with Unicode.

Examples:

♞ Cavalry
♙ Ashigaru
⛫ Castle

Battle Flow

  1. Select commander
  2. Choose troop count
  3. Choose formation
  4. Play optional Tactic Card
  5. Auto-resolve one round
  6. Repeat for multiple rounds

Rock–Paper–Scissors foundation:

  • Spear beats Cavalry
  • Cavalry beats Volley
  • Volley beats Spear

Modified by:

  • Leadership
  • Intelligence
  • Terrain
  • Weather
  • Morale
  • Officer relationships
  • Tactic cards

Example tactic cards:

  • Volley Fire
  • False Retreat
  • Furinkazan
  • River Trap
  • Night Raid

Implementation Order

Generate the code in this exact order:

  1. HTML/PHP shell
  2. Bootstrap + CSS
  3. DOM layout
  4. Constants
  5. Starting database
    • Base cards
    • 10 provinces
    • 5 clans
    • 15 historical officers
  6. ES6 classes
    • Card
    • Officer
    • Province
    • Clan
  7. GameEngine
  8. Save/Load
  9. UI renderer
  10. SVG map renderer
  11. Canvas battle renderer
  12. Initialization
window.onload = () => showStartScreen();