Steam Version Bonus

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

It includes the Galatium Express Token (worth $9.99):

+50% resource gain on map end
500k Au additional research grant (on top of the usual grants)

Sphere TD is also free to play on app stores. (no predatory monetizations)

About the Game

★ Sphere TD is free on app stores ★

Try the game on app stores to get a sense of the deep tower buildcraft. You can easily transfer your progress on any platform 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!

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

Steam Version Bonus

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

It includes the Galatium Express Token (worth $9.99):

+50% resource gain on map end
500k Au additional research grant (on top of the usual grants)

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).

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! ★

Orientation Complete

Complete the main tutorial. The Academy is thrilled you stopped aiming at your own infrastructure.

Unlock the Base panel. You are now trusted with the shield grid, the reactor feed, and several buttons labeled do not touch.

Unlock research tier one. You are now authorized to view the starter blueprints. The lab team has moved their personal mugs to a higher shelf.

Orientation Complete

Complete the main tutorial. The Academy is thrilled you stopped aiming at your own infrastructure.

Unlock the Base panel. You are now trusted with the shield grid, the reactor feed, and several buttons labeled do not touch.

Unlock research tier one. You are now authorized to view the starter blueprints. The lab team has moved their personal mugs to a higher shelf.

Unlock research tier two. Splitter mods are now legal in your hands, which prompted a controversial meeting at HQ.

Unlock research tier three. Your designs are now filed under aggressive innovation instead of incident report.

Unlock research tier four. Terminal-grade hardware is approved, and the safety officer has started avoiding eye contact.

Unlock research tier five. Complete blueprint clearance granted. If a portal opens, act surprised.

Max out a mod tier. This is what greatness looks like right before the casing blows off.

Apply the Advanced Crafting Matrix to mods. Please remember that the quantum probability board does not accept legal complaints.

Destroy one thousand spheres. For a Temporary Cadet, this counts as a stable start.

Destroy ten thousand spheres. The local pile of scrap metal now has its own postal code.

Destroy one hundred thousand spheres. We asked a quantum supercomputer to calculate your ammunition usage. It began to smoke.

Destroy five hundred thousand spheres. Environmental surveys now list your lane as a distinct biome.

Destroy one million spheres. High Command has quietly renamed your sector to the Exclusion Zone.

Destroy five million spheres. At this density, the wreckage is starting to generate its own minor gravitational pull.

Destroy ten million spheres. You have officially shattered the record previously held by an active planetary supervolcano.

Destroy fifty million spheres. Strategic Command no longer tracks enemy formations. They track whether you are awake.

Destroy two hundred and fifty million spheres. The spheres spent three eons traveling from the edge of the galaxy just to end up as your roof tiling.

Destroy one billion spheres. The defense budget of the next decade has been replaced with a sticky note on your desk that reads: 'Do whatever.'

Survive ten minutes in one endless session. The spheres were not expecting you to still be here. Neither, frankly, was the duty officer.

Survive thirty minutes in one endless session. Congratulations. You are now the longest-serving cadet in continuous contact with the enemy.

Survive one hour in one endless session. The spheres kept coming, but your replacements never arrived. Thankfully, your coffee ration did.

Survive two hours in one endless session. Your post has been reclassified from forward deployment to trench warfare.

Survive three hours in one endless session. Command has stopped asking when this will be over. They just labeled your zone 'do not disturb'.

Complete Galatium Command HQ world node. The first node on Earth-25, cleared by every cadet as a starter assignment. A surprising number of them are still here.

Complete Tier 390 world node. Most cadets at this depth are reconsidering their life choices. You are reconsidering your tower spacing.

Complete Tier 422 world node. You have no idea where HQ is from here, but you have a very clear idea of where your next node is.

Complete Tier 447 world node. At some point the map stopped being a mission and became a lifestyle.

Complete Tier 627 world node. Junior Cadet, Senior Cadet, Specialist Cadet. The title is temporary, but the cadet is here to stay.

Complete Tier 622 world node. Your tower build violates four Academy guidelines and at least one law of physics, but the spheres died anyway.

Complete Tier 626 world node. At some point the paperwork required to track how many spheres you destroy exceeded the paperwork required to deploy an entire squadron.

Complete Tier 706 world node. Your solo campaign has been so successful that you have started to wonder if you are the only cadet on Earth-25.

Complete Tier 868 world node. New recruits are briefed on standard procedures, tactical approaches, emergency protocols, and you specifically.

Complete Tier 915 world node. Other cadets file mission reports. You file highlight reels.

Today's Main Character

Complete Tier 1022 world node. Most cadets clear nodes. You clear nodes and have started assigning sphere names and narrating your own missions during debrief.

Complete Tier 1110 world node. You pushed all the way to the corner of Earth-25. There is nothing further to reach. The next wave, however, has already been dispatched.