---
title: "Dealing out the upgrades to the tower!"
subtitle: "How to upgrade towers"
date: 2025-10-29T00:00:00.000Z
category: tutorial
url: https://phaser.io/news/2025/10/dealing-out-the-upgrades-to-the-tower
site: Phaser - https://phaser.io
copyright: © 2026 Phaser Studio Inc. All rights reserved.
---

# Dealing out the upgrades to the tower!

*How to upgrade towers*

Cards appear after each wave ends, offering upgrades to tower stats. Learn to create a database-driven approach for tower upgrades with three rarity levels and weighted selection.

## Card Rarity System

The system uses three card levels with different drop rates:
- Minor cards: 77% chance (green color)
- Major cards: 21% chance (blue color)
- Giant cards: 1% chance (red color)

Each rarity level contains five upgrade types: gun damage, tower health, tower max health, runner speed, and tower rotational speed. Players have an equal chance of getting any upgrade within the selected rarity.

## Upgrade Mechanics

Each card contains a title, description, and upgrade amount. The upgrade amount multiplies current stats. For example, a 1.1 multiplier increases gun damage by 10%, while a 2.0 multiplier doubles it. Adding new cards requires updating the database and adding a condition in the update stats routine.

[Watch Tutorial](https://www.youtube.com/watch?v=cRagnnRBRq8)

---

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