Castle Must Be Mine

VR tower defense with heroes and spells you throw

TheMiddleGray · Released Jul 13, 2018

Reviews: Very Positive; 90% of 234
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 29, 2026
Steam Deck: Untested
Last update on Steam: 8 years ago; Apr 8, 2018
Minimum PC: GTX 970; 4 GB RAM · 1 GB disk; Full requirements

What is Castle Must Be Mine?

In this VR tower defense game, you protect a castle across forest, desert, and ice-field maps. You place towers at fixed sites, spend money from defeated enemies on construction and upgrades, and command a hero who gains experience. Castle cannons, throwable boulders, and traps help you stop ground and flying enemies.

For you if...

+you like replaying maps to earn every star

Not for you if...

−you want deep strategy with many tower options
−you prefer games that work without VR equipment

What players say

90% of 234 reviews are positive

Players praise the toy-like tabletop presentation. Complaints focus on limited content and persistent technical problems, including severe frame-rate drops when interacting with tower sites, particularly with Index hardware.

Screenshots and trailer

Castle Must Be Mine system requirements

Minimum: GTX 970, 4 GB RAM, 1 GB of disk space.

As published by the developer.

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Minimum

OS: Windows 7 SP1, Windows 8.1 or Windows 10
Processor: Intel® i5-4590, AMD FX 8350 equivalent or better
Graphics: NVIDIA GeForce® GTX 970, AMD Radeon™ R9 290 equivalent or better, Video Output: HDMI 1.4, DisplayPort 1.2 or newer
Memory: 4 GB RAM
Storage: 1 GB available space
Notes: 1x USB 2.0 or better port also required

Does Castle Must Be Mine have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Castle Must Be Mine run on Steam Deck?

Untested Not yet tested by Valve on Steam Deck.

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows
Steam features: Family Sharing, VR
Languages: Text only: English.

Does Castle Must Be Mine use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam