Alternate realities through headsets, such as augmented, mixed and virtual reality are becoming part of people's everyday life. Except in some limited context, usual keyboards are inappropriate for such technological medium and alternative interfaces for text-entry must be explored. In this paper we present the keycube, a general-purpose cubic handheld device that goes beyond the text-entry interface by including multiple keys, a touch-screen, an inertial unit with six degrees-of-freedom and a vibrotactile feedback. Strong of its form factor and affordance, the keycube offers advantages with regards to mobility, comfort, learnability, privacy and playfulness. Thus, the combination creates a novel text-entry interface convenient for many use cases across the whole reality-virtuality continuum.