Stronghold-Protocol

Project Overview

This project is an unofficial fan remake of the Arknights seasonal auto-chess tower-defense mode: it runs in the browser, supports solo simulation and 1-4 player online co-op, with rules and numbers checked against official data tables and PRTS.

The server is a Node.js program that only manages economy and turns while combat is simulated locally in each player's browser, so a low-power box can host a game.

Item	Value
Form	browser game + Node.js server
Players	solo or 1-4 co-op (no PvP)
Stack	JavaScript (Node.js)
License	GPL-3.0 (code only)
Version	v0.2.6

Play auto-chess tower defense in a browser and hold the gate with four friends.

Key Features

• Full match flow: confirm run info, strategy draft over 40 strategies, 14 combat turns and title settlement
• 4 difficulties: Standard, Perilous, Desperate and Ultimate with official parameters for solo and alliance modes
• Prep phase: recruit, refresh, freeze and upgrade the command center, drag units from the staging area
• Facing wheel deployment: pick unit orientation with a wheel for finer tower-defense placement
• Elite promotion: three same-name operators auto-merge into an elite with higher-tier abilities
• Online co-op: 1-4 players share a card pool, empty seats can take AI teammates
• Hidden core: qualifying runs on Perilous and above enter a 15th turn

Target Audience

• Arknights players
• Fans of auto-chess and tower defense
• Players who want PvE co-op with friends
• Players who like hosting their own servers

Quick Start

1. Download the full bundle from Releases (or the lite bundle, which fetches assets on first launch)
2. Extract and run the server script
3. Open the local address in a browser
4. Create a room and share the code with friends
5. Pick a difficulty, recruit in prep and fight in combat turns

Core Advantages

• Instant play: the browser is the client, no game install needed
• Lightweight hosting: the server only tracks economy and turns, low-power devices suffice
• Faithful numbers: rules and parameters verified against official tables and PRTS
• Co-op by design: no PvP, four players defending together

System Requirements

Item	Requirement
Server	Node.js 22 or 24
Client	a modern browser (Chromium-based preferred)
Deployment	Docker or source run supported

Notes

• Unofficial fan work: not affiliated with Hypergryph or Yostar, game assets belong to their owners and are not covered by the GPL
• Non-commercial only: selling, paid distribution and paid servers are strictly forbidden
• Bundle includes assets: the full bundle ships game assets, the lite bundle downloads them from a public mirror on first launch