<s>
Age	B-Application
of	I-Application
Empires	I-Application
:	I-Application
Castle	I-Application
Siege	I-Application
was	O
a	O
free-to-play	O
medieval	O
massively	B-Application
multiplayer	I-Application
online	I-Application
tower	B-Application
defense	I-Application
game	I-Application
in	O
the	O
form	O
of	O
a	O
Windows	B-Application
app	I-Application
,	O
designed	O
for	O
Windows	B-Device
8.1	I-Device
and	O
Windows	B-Protocol
Phone	I-Protocol
.	O
</s>
<s>
Unlike	O
any	O
preceding	O
Age	B-Application
of	I-Application
Empires	I-Application
game	O
,	O
Castle	B-Application
Siege	I-Application
takes	O
the	O
form	O
of	O
a	O
tower	B-Application
defense	I-Application
game	I-Application
.	O
</s>
<s>
Castle	B-Application
Siege	I-Application
was	O
made	O
available	O
on	O
iOS	B-Application
in	O
2015	O
and	O
Android	B-Application
in	O
2017	O
.	O
</s>
