The 30-Second Game
Design notes on a game we capped at 30 seconds. Why that duration, the scoring rule that makes it work, and the third-revision discipline.
Pop Bubbles (#22) is a 30-second game. The constraint was set before we wrote a line of code: the entire experience must complete in 30 seconds, with a clear end. This article is about why we chose that specific duration and what design decisions it forced.
Why 30 seconds specifically
The choice was deliberate. Casual games typically come in two duration classes: under one minute, where the entire session is the game; and over five minutes, where the session contains many small attempts. Pop Bubbles sits in the first class. We considered 60 seconds and 15 seconds before settling on 30.
60 seconds turned out to be too long — past the 45-second mark, players started to feel a session was a commitment, and the game's casual appeal dimmed. 15 seconds was too short — players felt they had not played yet when the timer ran out, and the score did not feel earned. 30 seconds was the duration that consistently produced "I want to play that again" as the immediate reaction. Three retries fit in two minutes, which is the natural session length for a page-load-time game.
The inverse-size scoring
The biggest single design choice in Pop Bubbles was making smaller bubbles worth more points. Many bubble-popping games score by quantity — pop more, score more — and that turns the game into a pure speed-tapping exercise. We wanted decisions per pop, so we made size the differentiator. A tiny bubble might be worth 25 points; a large lazy one only 5.
This single change produces every interesting moment in the game. A player decides whether to chase the high-value tiny bubble across the screen or settle for the easy low-value one nearby. A player decides whether to use the short combo window to grab a nearby big bubble or to navigate to a distant small one. These are the decisions that produce skill expression — and they would not exist if all bubbles scored the same.
The combo window
The second key decision was the half-second combo window. Pop a bubble within half a second of the last one, and the combo multiplier climbs by one. Wait too long, and it resets to one. This is a small mechanic that fundamentally changes how the game is played.
Without the combo, Pop Bubbles is "find the best bubble per moment". With the combo, it is "maintain a rhythm". A 1x score from a single small bubble is 25 points; a 5x combo bonus on the same bubble is 125. The combo is so valuable that maintaining it dominates the strategy — players will pop nearby big bubbles to keep the chain alive, then chase small ones once the chain is secure. This produces the cadence-and-burst pattern that the best moments in Pop Bubbles have.
We chose half a second after testing 0.3 seconds (too tight, broke the chain unfairly) and 1.0 seconds (too generous, made the combo trivial). Half a second sits at the boundary where the player must actually keep tempo to maintain the chain; faster pops than that are rewarded, but the rhythm has to be deliberate.
The mobile-first reality
Pop Bubbles is the most mobile-favouring game in the catalogue. The physical act of tapping bubbles with a thumb is satisfying in a way mouse clicks are not, and the tactile feedback of finger-on-glass aligns with the popping mechanic in a way no desktop input can match. We designed the bubble sizes for thumb accuracy on a phone screen, not for cursor accuracy on a desktop screen. On desktop, Pop Bubbles is fine; on a phone, it is meaningfully better.
This is honestly disclosed in the game's review. Players whose primary device is a desktop will find Pop Bubbles slightly less compelling than the average for the catalogue. Players on phones will find it slightly more so. The catalogue averages out — different games favour different devices — but on a per-game basis, the device matters.
What we cut
The version of Pop Bubbles we shipped is the third major revision. The first version had power-ups; we cut them because they distracted from the core decision. The second version had multiple rounds with escalating difficulty; we cut that because it pushed the game past 30 seconds. The version that shipped is simpler than what we started with — which is usually the right direction for casual games. The discipline of cutting features is at least as important as the discipline of adding them.
Published · 14 May 2026 · Written and signed by Bill