<s>
is	O
an	O
action-platform	O
video	O
game	O
developed	O
and	O
published	O
by	O
Hudson	O
Soft	O
for	O
the	O
Famicom	O
in	O
1985	O
.	O
</s>
<s>
The	O
game	O
was	O
originally	O
planned	O
as	O
a	O
port	O
of	O
the	O
ZX	B-Operating_System
Spectrum	I-Operating_System
video	O
game	O
Stop	B-Application
the	I-Application
Express	I-Application
(	O
later	O
released	O
for	O
the	O
Commodore	O
64	O
and	O
MSX	B-Operating_System
)	O
,	O
which	O
was	O
released	O
by	O
Sinclair	O
Research	O
Ltd	O
in	O
1983	B-Application
.	O
</s>
<s>
Stop	B-Application
the	I-Application
Express	I-Application
only	O
contained	O
the	O
first	O
train	O
level	O
,	O
and	O
3	O
levels	O
were	O
added	O
for	O
the	O
release	O
of	O
Challenger	B-Application
.	O
</s>
<s>
The	O
game	O
's	O
title	O
screen	O
displays	O
the	O
slogan	O
"	O
Realtime	O
Action	B-Application
Adventure.	O
"	O
</s>
<s>
The	O
game	O
is	O
uniquely	O
constructed	O
,	O
where	O
the	O
levels	O
consist	O
of	O
a	O
side-scrolling	O
platform	O
game	O
,	O
a	O
top-view	O
scrolling	O
shooting	O
game	O
,	O
and	O
a	O
fixed-screen	O
action	B-Application
game	I-Application
.	O
</s>
<s>
The	O
game	O
has	O
been	O
re-released	O
as	O
a	O
mobile	O
phone	O
application	O
,	O
and	O
was	O
made	O
available	O
on	O
the	B-Operating_System
Nintendo	I-Operating_System
Wii	I-Operating_System
Virtual	B-Application
Console	I-Application
for	O
500	O
Wii	B-Application
Points	I-Application
in	O
May	O
,	O
2007	B-Application
and	O
the	O
3DS	O
Virtual	B-Application
Console	I-Application
in	O
March	O
2013	O
.	O
</s>
<s>
The	O
game	O
was	O
also	O
coupled	O
with	O
Milon	B-Application
's	I-Application
Secret	I-Application
Castle	I-Application
(	O
in	O
Japan	O
)	O
and	O
released	O
for	O
the	O
Game	B-Device
Boy	I-Device
Advance	I-Device
as	O
part	O
of	O
Hudson	O
Best	O
Collection	O
Vol	O
.	O
</s>
<s>
3	O
Action	B-Application
Collection	O
compilation	O
on	O
December	O
22	O
,	O
2005	B-Application
.	O
</s>
<s>
A	O
Mobile	O
version	O
was	O
released	O
in	O
2005	B-Application
with	O
several	O
changes	O
in	O
gameplay	O
.	O
</s>
<s>
The	O
title	O
character	O
,	O
Challenger	B-Application
,	O
is	O
an	O
archaeologist	O
who	O
seeks	O
to	O
rescue	O
the	O
princess	O
,	O
Maria	O
,	O
from	O
the	O
hands	O
of	O
the	O
evil	O
boss	O
,	O
Don	O
Waldorado	O
,	O
in	O
the	O
land	O
called	O
Pleasio	O
Land	O
.	O
</s>
<s>
The	O
setting	O
of	O
the	O
character	O
as	O
an	O
archaeologist	O
is	O
an	O
homage	O
to	O
the	O
Indiana	O
Jones	O
franchise	O
,	O
while	O
his	O
name	O
may	O
be	O
an	O
allusion	O
to	O
Conan	O
Doyle	O
's	O
Professor	O
Challenger	B-Application
(	O
best	O
known	O
for	O
his	O
appearance	O
in	O
The	O
Lost	O
World	O
)	O
.	O
</s>
<s>
The	O
player	O
controls	O
the	O
main	O
character	O
,	O
Challenger	B-Application
,	O
and	O
must	O
head	O
towards	O
the	O
goal	O
in	O
each	O
level	O
.	O
</s>
<s>
In	O
most	O
other	O
games	O
,	O
the	O
A	O
button	O
is	O
used	O
to	O
jump	O
,	O
and	O
the	O
B	O
button	O
is	O
used	O
to	O
attack	O
,	O
but	O
in	O
Challenger	B-Application
,	O
the	O
controls	O
are	O
reversed	O
,	O
where	O
the	O
A	O
button	O
causes	O
the	O
character	O
to	O
attack	O
,	O
and	O
the	O
B	O
button	O
causes	O
them	O
to	O
jump	O
.	O
</s>
<s>
Falling	O
off	O
of	O
very	O
high	O
places	O
or	O
getting	O
caught	O
in	O
traps	O
also	O
results	O
in	O
a	O
loss	O
,	O
and	O
the	O
player	O
is	O
taken	O
to	O
the	O
game	B-Application
over	I-Application
screen	O
when	O
there	O
are	O
no	O
lives	O
remaining	O
.	O
</s>
<s>
The	O
first	O
level	O
(	O
or	O
"	O
scene	O
"	O
)	O
is	O
titled	O
"	O
STOP	B-Application
THE	I-Application
EXPRESS	I-Application
!	O
"	O
.	O
</s>
<s>
Challenger	B-Application
heads	O
for	O
the	O
front	O
train	O
car	O
while	O
avoiding	O
Waldorado	O
's	O
cronies	O
,	O
but	O
Waldorado	O
cuts	O
off	O
the	O
connection	O
between	O
the	O
rear	O
train	O
cars	O
and	O
escapes	O
after	O
pushing	O
Challenger	B-Application
off	O
the	O
train	O
.	O
</s>
<s>
The	O
challenger	B-Application
arrives	O
at	O
Waldorado	O
island	O
in	O
search	O
of	O
the	O
princess	O
,	O
and	O
ventures	O
through	O
an	O
extensive	O
4-directional	O
scrolling	O
game	O
map	O
.	O
</s>
<s>
The	O
princess	O
is	O
now	O
being	O
held	O
captive	O
in	O
a	O
pyramid	O
,	O
and	O
Challenger	B-Application
must	O
gather	O
the	O
three	O
keyword	O
items	O
(	O
a	O
key	O
,	O
a	O
ring	O
,	O
and	O
a	O
crown	O
)	O
that	O
are	O
spread	O
throughout	O
the	O
third	O
level	O
in	O
order	O
to	O
enter	O
the	O
pyramid	O
.	O
</s>
<s>
The	O
level	O
takes	O
place	O
in	O
the	O
inside	O
of	O
a	O
cave	O
,	O
where	O
Challenger	B-Application
must	O
use	O
the	O
gushing	O
fountains	O
of	O
water	O
as	O
steps	O
to	O
cross	O
over	O
to	O
the	O
other	O
side	O
.	O
</s>
<s>
Challenger	B-Application
arrives	O
at	O
the	O
pyramid	O
after	O
collecting	O
the	O
three	O
key	O
items	O
,	O
and	O
must	O
jump	O
across	O
several	O
dinosaur-shaped	O
rocks	O
to	O
reach	O
the	O
top	O
floor	O
,	O
where	O
he	O
will	O
face	O
Don	O
Waldorado	O
in	O
the	O
final	O
battle	O
.	O
</s>
<s>
Challenger	B-Application
must	O
defeat	O
him	O
in	O
the	O
final	O
showdown	O
in	O
level	O
4	O
,	O
where	O
he	O
can	O
be	O
defeated	O
with	O
four	O
throwing	O
knives	O
.	O
</s>
<s>
Challenger	B-Application
's	O
life	O
gauge	O
refills	O
while	O
they	O
appear	O
on	O
screen	O
,	O
and	O
they	O
can	O
also	O
be	O
killed	O
off	O
with	O
the	O
throwing	O
knife	O
for	O
400	O
bonus	O
points	O
(	O
they	O
are	O
resurrected	O
if	O
the	O
player	O
scrolls	O
away	O
from	O
the	O
area	O
)	O
.	O
</s>
<s>
Killing	O
the	O
hovering	O
whale	O
in	O
level	O
1	O
causes	O
Challenger	B-Application
to	O
become	O
invincible	O
.	O
</s>
<s>
Challenger	B-Application
can	O
obtain	O
the	O
item	O
by	O
hitting	O
it	O
with	O
a	O
knife	O
,	O
but	O
he	O
will	O
receive	O
damage	O
if	O
he	O
comes	O
in	O
direct	O
contact	O
with	O
the	O
item	O
.	O
</s>
<s>
Obtaining	O
the	O
power	O
sword	O
causes	O
Challenger	B-Application
's	O
sprite	O
color	O
to	O
change	O
for	O
a	O
short	O
period	O
of	O
time	O
,	O
during	O
which	O
his	O
walking	O
speed	O
increases	O
,	O
and	O
he	O
gains	O
the	O
ability	O
to	O
kill	O
any	O
of	O
the	O
enemies	O
on	O
the	O
screen	O
with	O
his	O
throwing	O
knives	O
.	O
</s>
<s>
An	O
i-appli	O
mobile	O
application	O
version	O
of	O
Challenger	B-Application
was	O
released	O
on	O
August	O
1	O
,	O
2005	B-Application
for	O
cellphones	O
supporting	O
i-appli	O
in	O
Japan	O
.	O
</s>
<s>
Challenger	B-Application
has	O
a	O
life	O
gauge	O
for	O
all	O
of	O
the	O
levels	O
,	O
meaning	O
he	O
cannot	O
die	O
from	O
a	O
single	O
hit	O
from	O
an	O
enemy	O
.	O
</s>
<s>
Challenger	B-Application
can	O
move	O
in	O
the	O
diagonal	O
direction	O
for	O
the	O
top-view	O
second	O
level	O
,	O
and	O
Challenger	B-Application
can	O
throw	O
knives	O
while	O
jumping	O
in	O
the	O
three	O
other	O
levels	O
.	O
</s>
