<s>
Happy	B-Application
Trails	I-Application
is	O
a	O
video	O
game	O
programmed	O
by	O
Carol	O
Shaw	O
for	O
the	O
Intellivision	B-Operating_System
console	O
and	O
released	O
by	O
Activision	O
in	O
1983	B-Application
.	O
</s>
<s>
Shaw	O
previously	O
wrote	O
River	B-Application
Raid	I-Application
for	O
the	O
Atari	O
2600	O
.	O
</s>
<s>
Happy	B-Application
Trails	I-Application
is	O
a	O
clone	O
of	O
the	O
1982	O
Konami	O
arcade	O
game	O
Loco-Motion	B-Application
.	O
</s>
<s>
Mattel	O
was	O
working	O
on	O
an	O
official	O
port	O
,	O
but	O
Happy	B-Application
Trails	I-Application
was	O
published	O
first	O
,	O
resulting	O
in	O
Loco-Motion	B-Application
being	O
sold	O
at	O
a	O
discount	O
and	O
without	O
any	O
marketing	O
support	O
.	O
</s>
