Royal Defense - Invisible Threat game cover

Royal Defense - Invisible Threat CD Key

Invisible Threat is a tower defense game featuring three new episodes: Wasteland, Fiery Plateau, and Mystic Valley. Face new enemies and utilize unique units, including Skeletons and Elementals, to master challenging levels. The DLC includes four new achievements and 150 free crystals for upgrades.

Looking for the best price for Royal Defense - Invisible Threat? Compare offers from 3 stores on CheckGamePrices to find the cheapest Steam key available. Right now, the lowest price is 0.47$ at Kinguin, which is 76% cheaper than the current Steam price (1.99$).

Current Lowest Price

0.47$

Visit store

Kinguin

Royal Defense - Invisible Threat screenshot 1

Release Date

04 Dec, 2014

Publisher/Developer

Good Games, Creobit, 8floor

Reviews

Steam: 80.00% positive (4/5)

Metacritic: -

Check more Steam statistics for Royal Defense - Invisible Threat

Game Tags

Strategy Indie Casual

System Requirements

Minimum:

OS *: Windows XP SP3
Processor: 1500 MHz
Memory: 512 MB RAM
Graphics: OpenGL 3.0 compliant with 1.0GB of video RAM
DirectX: Version 9.0
Storage: 75 MB available space

Royal Defense - Invisible Threat Steam Price History Chart

Current Steam price: 1.99$
Lowest Steam price ever: 0.99$ — 2025-07-28

Loading Royal Defense - Invisible Threat price history chart...

Royal Defense - Invisible Threat description

The kingdom remains under siege in Royal Defense - Invisible Threat, an exciting expansion featuring three new episodes tailored for dedicated tower defense enthusiasts. Immerse yourself in this thrilling adventure as you face heightened challenges and new adversaries that demand fresh strategies to conquer!

Wasteland: Navigate treacherous cliffs inhabited by cunning orcs.
Fiery Plateau: Engage in fierce battles on a blazing plateau, eliminating all foes in your path.
Mystic Valley: Protect your realm from enchanting mystical creatures lurking in an enchanted forest.

This DLC introduces four innovative units, each boasting unique abilities: the Skeleton, Necromancer, Fire Elemental, and Nature Elemental. Additionally, players can tackle four new achievements, with unique quests crafted specifically for each episode, providing ample challenges to test your skills.

As a bonus, players receive 150 free crystals for store upgrades, allowing for personalization and enhancement without affecting gameplay completion. Your feedback is invaluable—share your thoughts and suggestions to help refine the game and elevate the tower defense genre!