Read this first. Everything here is original writing. There are no screenshots, sprites, logos or box art from real games, and facts are stated in general terms. How we work.
The glass
The glass changed shape. Phone screens are small, bright, tall and touchable, and they are held a hand’s breadth from the eye. Pixels were dense enough that individual dots disappeared, which meant artists no longer worked around the grid. What they worked around was the thumb, which hides about a centimetre of screen at any time and does not forgive small targets.
The visual style that followed was flat. Gradients and gloss gave way to solid colours, large shapes and plenty of space. Part of it was taste: after years of bevels and shine, a clean field of colour felt calm. Part of it was practical: flat shapes are cheap to draw, scale to any screen size, and stay legible in sunlight on a bus. A square with a strong colour and good contrast reads from a metre away, and that is the whole job.
Colour as feedback
When a game has one control and little text, colour does the talking. A hue shift means a new stage. A pulse means you scored. A single bright shape against a pale ground says: this is the thing. Designers learned to use a small set of colours, change them gradually as a run progressed, and let the background tint itself to track the player’s progress. That slow drift of colour is one of the loveliest inventions of the period, and it costs almost nothing.
Small, sharp, fast
On the technical side, phones were powerful and the browser had finally grown up. A canvas element could draw at full speed, audio was available, and the same code could run on a desktop and a handset. A complete game could be a few hundred kilobytes and start in a second. Compared with the early web, the budget was roomy. The best designers kept it tight anyway, because tight had become the style.
Sound was short and generous: a soft click on every tap, a rising chime on every point, a low thud on failure. Music was often optional, since many players were on public transport with the sound off. A game that was readable and satisfying in silence was a game that survived in the wild, and the best of them still offered a small, quiet pleasure with the sound on.
The input
One tap. The constraint sounds absurdly narrow, and it turned out to hold a whole design space. If a tap can mean jump, flip, let go, grab, release, change direction, then a single control is never really single: its meaning depends on timing and context. The timing is the skill. Hold or release, early or late, rhythm or reaction.
Touch has its own grammar. Taps are quick and imprecise, drags are continuous, holds carry intention. Swipes give four directions without a controller. Good one-thumb games choose one of these and stick to it. Fumbling between modes is the surest way to frustrate someone on a train.
The device’s sensors added to the repertoire. A tilt could steer, a shake could reset, and the whole phone was a controller. Most designers used these sparingly, because the room is rarely steady and the bus is rarely smooth.
Fairness at a glance
With little time and little text, a one-tap game has to be fair in the first three seconds. The player must see why they died and believe they could have done it differently. That is a high bar, and the games that cleared it did so with generous hit boxes, visible hazards and clean restarts. Failure that arrives with a clear cause and an immediate retry is not frustrating. It is a promise.
The room
The room was wherever you were. Bus stops, queues, kitchens, the gap between two meetings, the last minute before a film. Phones turned every pocket of waiting time into a place to play. Sessions were measured in seconds and minutes, and a game that could not be dropped and picked up again was a bad fit.
Distribution changed again. App stores replaced portals, and a game could reach a worldwide audience in a day, if it was noticed. Word of mouth, screenshots and a friend’s score did more than any advertisement. Several of the most talked-about games of these years were made by one or two people in a few weeks, and some were removed by their creators at the height of their fame, which made the moment feel even stranger.
Scores were social in a new way. A friend posts a number, you beat it, you post yours. The number is simple and can be understood by anyone. There is no tutorial to explain it, which is the reason the games spread. Anyone can describe a run in one sentence, and the sentence invites a reply.
The browser stayed relevant for people who preferred it, and the web’s old virtue of a link that opens straight into a game quietly came back. A page that loads in a second and is ready to play in two has an advantage that no store listing can match. That is the spirit of this site.
Three design ideas we borrowed
One tap, two meanings
In Pendulum Pop, a tap lets go and the next tap grabs the nearest anchor. The same control swaps roles depending on state, and timing makes it an instrument. A one-tap game is a conversation between your thumb and a clock, and the best ones let you hear the rhythm.
Put the beat in the physics
Tap Tides asks you to hold to dive and release to rise, threading pearls that fall on the beat of the tide. Because the action is continuous, you feel the rhythm in your thumb, and a mistake is a late arrival, not a wrong choice. Rhythm gives a one-control game a kind of grammar for free.
Be honest about the scope
One Thumb Hop, still in the workshop, is a flat blob bouncing between sliding rooftops, and that is the whole game. The design lesson of the period is to say what the game is in a sentence and then execute that sentence beautifully. Nothing to unlock, nothing to explain, and enough depth that the sentence takes a year to master.
One Thumb Hop, 2013 In the workshop
Games from this era on Eracade
- Pendulum Pop Play
- Tap Tides Play
- One Thumb Hop In the workshop
What ended the era
This hall is, in a sense, still open, and that is why the museum stops at 2014. The conventions of the one-tap era went on to shape the interface, monetisation and retention of a great deal of what came after, including things we have decided to leave out of Eracade: timers that nag, currencies that confuse, notifications that guilt. The craft was real. The business around it sometimes was not.
What we take from the period is the discipline. Choose one verb. Make it feel wonderful. Let failure be quick and honest. Give the player a number they can say out loud. If the first six halls are about what hardware allowed, this one is about what remains when hardware allows nearly anything and a designer decides to use almost none of it.
Further reading
Outside links are chosen for being stable, general and free to read. We link; we do not copy.
- Endless runner (Wikipedia) The genre that thrived on one-button control.
- Mobile game (Wikipedia) A broad survey of games made for phones.
- Touchscreen (Wikipedia) How capacitive touch screens detect fingers.
- HTML5 (Wikipedia) The standard that gave the browser its drawing surface and audio.
Stamp this hall
If you have read this far, take a stamp for your Passport. It is saved in this browser only, next to your game stamps, and nothing is sent anywhere.
Spotted a mistake? Send a correction to hello@eracade.com.