Quack!

## Description

_Quack!_ is a clone of the mobile game Flappy Bird for the ZX81 computer. The
gameplay is the same as in the original. The player controls a bird which has
to be navigated through the gaps of an endless amount of pipes. The bird
automatically moves forward and all the player has to do is tapping a key (any
will do) to increase the altitude of the bird. Not tapping causes the bird to
fall. The player scores for each pair of pipes the bird passes and the game
ends when it crashes into a pipe or into the ground.

Quack!