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A logic-puzzle tower defense. Build every tower from scratch and min-max it.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
Tracked since Jul 7, 2026.
Official stores with direct support.
Try this game before buying.
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.
33 base mods x Mk (1-5) x Bside x 3 Perks x 5 Tiers x Adv Craft = Actually more than 1 mil but u get the idea.
After action report means building more towers. No sleeping on the job, cadet!
P2W don't apply to the steam or mobile (or any) version. This image is just showing off cool explosions.
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!
The Steam version is a premium big screen experience (no IAP), and has the same features on all platforms.
+50% resource gain on map end
500k Au additional research grant (on top of the usual grants)
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.
- 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-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).
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. :)
Right now the cheapest offer for Sphere TD is CA$16.49 at Steam. KingsPrice compares 1 offers from 1 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for Sphere TD is CA$14.84 (recorded on Jul 7, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
Create a free price alert on this page and KingsPrice will email you when Sphere TD drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
