Darkball vs Sphere TD
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Darkball
Test your predictive abilities by tapping the screen at the precise moment a ball enters a target area. This game challenges your brain's capacity to anticipate events based on subtle cues, similar to how athletes predict ball trajectories.
- Predictive ball interception gameplay
- Tests brain's anticipation skills
- Simple tap-to-intercept mechanic
- Challenges timing and prediction
- Minimalist visual cues
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Tap the screen when you think the ball will appear in the target. The ball will only flash twice. The first flash happens when the ball drops and the second flash happens on the line. You’re goal is to tap the screen when you think the ball will appear in the orange target area. Cristiano Ronaldo can famously volley a corner kick in total darkness. The magic behind this remarkable feat is hidden in Cristiano’s brain which enables him to use advance cues to plan upcoming actions. Darkball challenges your brain to do the same, distilling that scenario into its simplest form - intercept a ball in the dark. All you see is all you need. One of the brain’s fundamental functions is to use information from the past and present to predict the future. This function is key to how animals, from dragonflies to humans, navigate a dynamic and uncertain world. To make predictions, the brain must have an “internal model” of the system it interacts with. A basic form of this function is at play when we move our body. For example, to reach for a cup, the brain must have a model to predict how the hand would respond to various motor commands. Internal models are also thought to play a crucial role when we mentally predict future states of the environment, for example when we track a ball as it moves behind another object. Here, we have designed a simple task to understand how the nervous system makes such predictions. In this task, subjects have to intercept a ball when it reaches its final position. By changing the speed of the ball, the intervals when it is invisible, and the target position, we will test various hypotheses about the algorithms that are used to integrate information about past and present to make predictions about future.
Sphere TD
A complex tower defense game where you build and upgrade towers to defend against waves of spheres. Strategize with deep customization, resource management, and research to overcome challenges. Offers extensive replayability with numerous levels and modes.
- Tower and projectile customization
- 30 base towers with 28+ stats
- 33 mods with millions of combinations
- Research and crafting system
- Tower inventory and energy management
- 50 hand-crafted levels and endless mode
- Offline and online play with cloud sync
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Sphere TD is a tower defense game with one difference: there are no preset towers. You build every tower yourself, then send it out to defend your base. WHAT IS IN THE GAME - 39 towers, each with its own grid layout and function - 33 mods, each with tiers, MK upgrades, a B-Side function, and 3 perks - 50 hand-crafted maps with three objectives each - Endless mode after map 50, plus map-specific challenges - A research tree, mod crafting, and a trader - Spheres that scale into elites, bosses, armored, shielded, cloaked and flying - Offline play, with cloud sync and leaderboards - Cross platform: mobile and desktop NO NONSENSE No pay to win. No time gates. No paywalls. No ad spam. No loot boxes. Funding the Galatium Academy is appreciated, never required. MESSAGE FROM THE DEV Hi, I'm Alex, a solo developer, and Sphere TD is my first game. If you like tower defense, meta progression, and theorycrafting builds, you should feel right at home. Come discuss tower builds with other friendly cadets on Discord. I am committed to 10 years of support. You want it, I'll make it. Ready to join the Galatium Academy?
Screenshots
Verdict
The clearest difference is review sentiment: Sphere TD at 100% against Darkball's 0%. Sphere TD also leads on rating (4.6 vs 4.1) and update cadence (every 2 days vs every 68 months). Darkball's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price, ratings volume, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Sphere TD sells 10 one-off in-app purchases. Darkball asks for nothing beyond the download.
Sphere TD holds the better App Store score, 4.6 against 4.1. Both are backed by a comparable volume of ratings — 15 and 9 respectively. Written reviews point the same way: 0% of Darkball's written reviews are positive against 100% of Sphere TD's.
Darkball ships an update every 68 months, Sphere TD every 2 days. The most recent releases landed on September 20, 2026 and September 23, 2026 respectively.
| Parameter | Darkball | Sphere TD |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (15 ratings) | 4.6 (9 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 9 |
| Update frequency | Every 68 months | Every 2 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 0 MB | 332 MB |
| Age rating | 4+ | 12+ |
| Developer | CW&T | StandardIssueGames |
Customer experience
Darkball
Sphere TD
In-app purchases
Darkball
No in-app purchases
Sphere TD
- Au Field Ration$4.99
- Defender Starter Pack$7.99
- Au Supply Cache$9.99
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- Galatium Express Token$9.99
- Galatium Academy Pack$14.99
- Shadow Broker Vantage$19.99
- Au Enterprise Fund$24.99
- Flux Enrichment Grant$24.99
- Au Strategic Stockpile$49.99
- Au Global Reserve$99.99









