  Game-semantic models usually start from the core model of the prototypical
language PCF, which is characterised by a range of combinatorial constraints on
the shape of plays. Relaxing each such constraint usually corresponds to the
introduction of a new language operation, a feature of game semantics commonly
known as the `Abramsky Cube'. In this presentation we relax all such
combinatorial constraints, resulting in the most general game model, in which
all the other game models live. This is perhaps the simplest set up in which to
understand game semantics, so it should serve as a portal to the other, more
complex, game models in the literature. It might also be interesting in its own
right, as an extremal instance of the game-semantic paradigm.
