What makes an on-screen keyboard fun?

The default iOS on-screen keyboard needs a lot of screen real estate for things we don’t care about: language settings, microphone input, a space bar and word suggestions. Most modern on-screen keyboards are predictive in that they try to figure out what it is you want to write. This works okay-ish for writing a quick SMS, but quickly becomes obstructive for a typing game. It was clear that if we wanted to bring ZType to mobile devices and make it fun to play, we’d have to come up with a custom keyboard solution.