<s>
Earth	B-Application
and	I-Application
Sky	I-Application
is	O
an	O
interactive	O
fiction	O
trilogy	O
written	O
and	O
produced	O
by	O
American	O
author	O
Paul	O
O'Brian	O
about	O
the	O
adventures	O
of	O
a	O
brother	O
and	O
sister	O
who	O
gain	O
superpowers	O
while	O
searching	O
for	O
their	O
lost	O
parents	O
.	O
</s>
<s>
The	O
story	O
file	O
can	O
be	O
downloaded	O
for	O
free	O
online	O
and	O
though	O
O'Brian	O
recommended	O
using	O
Frotz	O
,	O
Earth	B-Application
and	I-Application
Sky	I-Application
is	O
compatible	O
with	O
several	O
interpreter	B-Application
programs	I-Application
which	O
are	O
available	O
as	O
freeware	O
.	O
</s>
<s>
Earth	B-Application
and	I-Application
Sky	I-Application
made	O
its	O
competition	O
debut	O
in	O
2001	O
finishing	O
eighth	O
at	O
the	O
7th	O
annual	O
Interactive	O
Fiction	O
Competition	O
making	O
it	O
the	O
least	O
successful	O
game	O
of	O
the	O
series	O
.	O
</s>
<s>
Another	B-Application
Earth	I-Application
,	I-Application
Another	I-Application
Sky	I-Application
is	O
longer	O
than	O
the	O
first	O
game	O
and	O
featured	O
more	O
puzzles	O
as	O
well	O
as	O
the	O
option	O
of	O
using	O
super	O
strength	O
to	O
simply	O
break	O
through	O
some	O
obstacles	O
.	O
</s>
<s>
Luminous	B-Application
Horizon	I-Application
placed	O
first	O
in	O
the	O
10th	O
Interactive	O
Fiction	O
Competition	O
in	O
2004	O
and	O
was	O
nominated	O
for	O
Best	O
Individual	O
PC	O
and	O
Best	O
NPCs	O
in	O
the	O
2004	O
XYZZY	O
Awards	O
.	O
</s>
