lazyfrog - originally intended as an entry for the 2003 Minigame
  Compo, but not actually entered.

Public domain by Russell Marks (rus@svgalib.org)

for 1K ZX81 (should also work on 16K machines and emulators)


lazyfrog is a minimalistic Frogger clone, which is a fairly lazy port
of my speccy `easyfrog' from 2002 (hence the name :-)). It's not up to
much, but just the fact that it can run on a 1k ZX81 makes it
moderately interesting, so I thought I'd finally release it.

The aim of the game is simple - get your frog across the road and the
river. Making it over the road is simple enough, just avoid the cars.
But apparently you're some kind of hydrophobic frog, and you have to
ride on the logs to cross the river. Once you get past the river, you
should jump the frog into a vacant `home' (blank square). If you fill
all four homes, you get another - slightly faster - level to try.

You get 3 lives, shown at the top-right of the play area (score is
shown at the top-left). If you lose all of them it's game over, and
after a two-second wait, a new game starts.

The controls are:

Q   up
A   down
O   left
P   right

Known bugs:

- if you dive the frog into the water, missing the logs, it (before
  dying) follows the log movement for one `frame' even though it's not
  actually on a log.

- the screen is tiny. This is necessary as the machine only has 1k of
  RAM, which includes screen memory!

- it's probably still too easy. :-)

-Rus.
