<s>
Clumsy	B-Application
Ninja	I-Application
is	O
an	O
action-adventure	O
video	O
game	O
for	O
iOS	B-Application
and	O
Android	B-Application
,	O
developed	O
and	O
published	O
by	O
NaturalMotion	O
in	O
2013	O
.	O
</s>
<s>
In	O
the	O
game	O
the	O
player	O
trains	O
a	O
ninja	B-Application
by	O
having	O
them	O
complete	O
tasks	O
in	O
order	O
to	O
gain	O
experience	O
points	O
.	O
</s>
<s>
Within	O
its	O
first	O
week	O
of	O
release	O
,	O
Clumsy	B-Application
Ninja	I-Application
was	O
downloaded	O
more	O
than	O
10	O
million	O
times	O
.	O
</s>
<s>
The	O
story	O
is	O
told	O
from	O
3rd	O
person	O
perspective	O
by	O
the	O
ninja	B-Application
clue	O
book	O
.	O
</s>
<s>
The	O
main	O
aim	O
of	O
the	O
game	O
is	O
to	O
save	O
Clumsy	B-Application
Ninja	I-Application
's	O
training	O
partner	O
&	O
friend	O
Kira	O
from	O
Hori-Bull	O
,	O
the	O
antagonist	O
,	O
whose	O
main	O
aim	O
is	O
to	O
find	O
the	O
Dragon	O
Medallion	O
.	O
</s>
<s>
Clumsy	B-Application
Ninja	I-Application
,	O
Lily	O
,	O
the	O
chicken	O
,	O
the	O
squirrel	O
and	O
the	O
Sensei	O
arrive	O
to	O
the	O
temple	O
environment/area	O
to	O
find	O
Kira	O
and	O
save	O
her	O
from	O
Hori-Bull	O
.	O
</s>
<s>
Gameplay	O
centers	O
around	O
training	O
the	O
ninja	B-Application
and	O
improving	O
their	O
"	O
ninja	B-Application
skills	O
"	O
.	O
</s>
<s>
The	O
player	O
can	O
train	O
the	O
ninja	B-Application
by	O
doing	O
certain	O
activities	O
such	O
as	O
:	O
playing	O
hide	O
and	O
seek	O
,	O
playing	O
on	O
the	O
trampoline	O
,	O
training	O
with	O
a	O
punching	O
bag	O
and	O
many	O
other	O
activities	O
to	O
earn	O
experience	O
(	O
xp	O
)	O
.	O
</s>
<s>
As	O
the	O
ninja	B-Application
improves	O
his	O
skills	O
he	O
earns	O
new	O
belts	O
.	O
</s>
<s>
Another	O
big	O
part	O
of	O
the	O
game	O
is	O
traveling	O
the	O
country	O
and	O
completing	O
quests	O
,	O
doing	O
so	O
will	O
unlock	O
new	O
items	O
that	O
can	O
be	O
used	O
to	O
further	O
train	O
the	O
ninja	B-Application
,	O
along	O
with	O
more	O
storyline	O
details	O
.	O
</s>
<s>
Clumsy	B-Application
Ninja	I-Application
is	O
the	O
first	O
mobile	O
game	O
to	O
use	O
the	O
Euphoria	B-Application
physics	O
engine	O
.	O
</s>
<s>
On	O
release	O
,	O
Clumsy	B-Application
Ninja	I-Application
became	O
the	O
first	O
app	O
to	O
be	O
promoted	O
with	O
a	O
video	O
trailer	O
embedded	O
in	O
the	O
App	O
Store	O
.	O
</s>
<s>
The	O
game	O
received	O
"	O
generally	O
favorable	O
reviews	O
"	O
according	O
to	O
the	O
review	B-Application
aggregation	I-Application
website	O
Metacritic	O
.	O
</s>
<s>
TouchArcade	O
said	O
,	O
"	O
NaturalMotion	O
has	O
created	O
something	O
very	O
impressive	O
and	O
they	O
clearly	O
want	O
to	O
show	O
off	O
their	O
little	O
ninja	B-Application
and	O
what	O
he	O
can	O
do	O
...	O
"	O
</s>
<s>
Clumsy	B-Application
Ninja	I-Application
received	O
10	O
million	O
downloads	O
as	O
of	O
December	O
2013	O
.	O
</s>
