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★ Try the free demo now! 50 Core maps + 1 Endless maps. There's 20+ hours of content. ★

Try the demo to get a sense of the deep tower buildcraft, up to Tier 3 mod research. You can easily transfer your progress to the Early Access (or mobile) version via the in-game cloud sync!

This is a complex but rewarding TD. Featuring high replayability (Top 100 cadets have spent 110+ hours), deep RPG builds, with roguelite and incremental elements.

You will need to build EVERY tower. No presets.

Defend your base, ideally by spamming hundreds of projectiles down the sphere's path.

Pick ModCards for a small (or legendary) boost to your base or drone tower.

After action report means building more towers. No sleeping on the job, cadet!

Destroy spheres for profit or just mine ores. Are your towers are up to the job?

Got rich from mining? Here's how to spend your gold. More theory-crafting and actual crafting.

The Galatium Academy allows Cadets plenty of freedom and free time in the Sphere Simulacrum.

Join the Galatium Academy (for profit organization) for a career in Sphere TD!

★  380+ cadets are planning their tower builds. Check out our discord community, side panel -->   ★

RPG + TD ● Mod & Build Towers ● Roguelite ModCards ● Meta Progression

Spheres are invading Earth-25. Build your towers and mod your projectiles — split it, add it, bounce it, chain it, multiply it! A true 1 tower = 1,000,000+ builds. Min-max tower, craft mods, pick ModCards, fly drones, mine ores, idle and enjoy the music, the choice is yours.

Highlights

- Build & mod your towers and projectiles! Nothing is premade!

- 39 towers with unique layouts and functions.

- 33 mods, each with tiers, MK upgrades, a B-Side function, and 3 unique perks

- Research, advanced mod crafting, and long-term progression.

- Tower inventory and energy management.

- 50 hand-crafted levels, endless mode, and map-specific challenges.

- A massive world map with 52,000 nodes and procedurally generated setups.

- Play offline. Online features like cloud sync and leaderboard are also supported.

Community & Long Term Support

- Community-driven events and active feature development via Discord.

- 10 years of support. Build the game with me. You want it, I'll make it.

- Cross Platform (desktop and mobile).

Steam Version Difference

The Steam version is a premium big screen experience (no IAP), and has the same features on all platforms.

It comes with the Galatium Express Token:

• +50% resource gain on map end

• 500k Au additional research grant (on top of the usual grants)

Message from the Dev

Hi! I'm Alex, a solo developer, and I'm excited to show you my first game, Sphere TD. If you enjoy tower defense, RPG theorycraft, factory/puzzle builds, roguelike choices, and incremental progression, you should feel right at home. If not, hop over to our Discord and I'm happy to answer any questions you may have. :)

★ Wishlist now and join the Galatium Academy! ★