Nexus: The Progression & Skill Tree Engine

Nexus Progression Engine

Stop building systems. Start designing progression.

Every great RPG needs a satisfying sense of growth—skill unlocks, achievements, and rewards that feel earned. But building those systems from scratch is complex and time-consuming.

Nexus is a complete, production-ready progression framework for Unity. It handles the architecture behind skill trees, achievements, and leveling curves so you can focus on designing how your players advance—not debugging the systems that make it happen.

Core Features

Designer-Friendly Skill Trees
Create branching skill trees directly inside the Unity Editor using ScriptableObject assets. Define costs, prerequisites, and level requirements in the Inspector—no code required.

Multi-Criteria Achievements
Build achievements that track one or multiple objectives. The built-in AchievementTracker listens for any event you define (e.g., OnEnemyKilled, OnItemCrafted, OnQuestCompleted) and updates progress automatically.

Data-Driven Leveling Curve
Use a simple AnimationCurve inside a ScriptableObject to visually control XP growth from level 1 to 100. Adjust scaling and balance in seconds without touching code.

Flexible Reward System
Assign custom rewards for unlocking skills or completing achievements—XP, stats, items, abilities, or your own gameplay events.

Fully Modular and Extensible
Every system is written in clean, well-documented C#. You can extend or override any component without breaking the framework.

What’s Included

• .unitypackage file for one-click import

• .zip file with complete, organized source code

• All C# source scripts, fully commented and modular

• Demo scene showing a working skill tree and achievement system

• PDF integration guide with setup walkthrough and code references

Example Use Cases

• RPGs and Action Games – Implement scalable XP, skills, and unlock trees.

• Survival or Sandbox Games – Add crafting-based achievements and unlockable perks.

• Mobile or Idle Games – Integrate data-driven level scaling and automated progress tracking.

Requirements

• Unity 2022.3 LTS or newer

• TextMeshPro package installed

• URP and HDRP compatible

• Tested on Windows and Android

Refund Policy

All sales are final. No refunds are issued for digital downloads. Please review the description and included features carefully before purchase. For support, setup guidance, or customization inquiries, contact Rottencone83 Studios through Itch.io or Ko-fi.