<s>
Liero	B-Application
is	O
a	O
video	O
game	O
for	O
MS-DOS	B-Application
,	O
first	O
released	O
by	O
Finnish	O
programmer	O
Joosa	O
Riekkinen	O
in	O
1998	O
.	O
</s>
<s>
The	O
game	O
has	O
been	O
described	O
as	O
a	O
real-time	B-General_Concept
version	O
of	O
Worms	B-Application
(	O
a	O
turn-based	O
artillery	B-Application
game	I-Application
)	O
.	O
</s>
<s>
Liero	B-Application
is	O
Finnish	O
for	O
'	O
earthworm	O
 '	O
and	O
is	O
pronounced	O
.	O
</s>
<s>
Inspired	O
itself	O
by	O
the	O
earlier	O
game	O
MoleZ	B-Application
,	O
Liero	B-Application
provided	O
inspiration	O
for	O
the	O
later	O
games	O
Soldat	B-Language
and	O
Noita	B-Language
.	O
</s>
<s>
In	O
Liero	B-Application
,	O
two	O
worms	B-Application
fight	O
each	O
other	O
to	O
death	O
for	O
score	O
(	O
or	O
frags	O
)	O
using	O
a	O
choice	O
of	O
five	O
weapons	O
from	O
a	O
total	O
of	O
40	O
in	O
a	O
two-dimensional	O
map	O
.	O
</s>
<s>
Unlike	O
most	O
side-scrolling	O
deathmatch	O
games	O
,	O
the	O
weapons	O
in	O
Liero	B-Application
have	O
infinite	O
ammo	O
.	O
</s>
<s>
Liero	B-Application
depends	O
all	O
on	O
timing	O
and	O
swift	O
maneuverability	O
.	O
</s>
<s>
It	O
can	O
be	O
played	O
by	O
two	O
human	O
players	O
simultaneously	O
in	O
split	O
screen	O
or	O
in	O
a	O
single	O
player	O
mode	O
against	O
the	O
game	O
's	O
artificial	B-Application
intelligence	I-Application
,	O
although	O
the	O
game	O
's	O
popularity	O
is	O
derived	O
mostly	O
from	O
the	O
fast-paced	O
player-vs.-player	O
action	O
it	O
provides	O
.	O
</s>
<s>
Joosa	O
Riekkinen	O
developed	O
Liero	B-Application
as	O
DOS	O
game	O
with	O
the	O
first	O
version	O
released	O
in	O
1998	O
.	O
</s>
<s>
Liero	B-Application
was	O
inspired	O
by	O
the	O
previous	O
freeware	B-License
game	O
MoleZ	B-Application
,	O
and	O
took	O
many	O
weapons	O
and	O
sounds	O
from	O
its	O
precursor	O
.	O
</s>
<s>
The	O
original	O
Lieros	O
latest	O
version	O
was	O
1.33	O
,	O
which	O
was	O
released	O
in	O
1999	B-Application
.	O
</s>
<s>
However	O
,	O
the	O
author	O
lost	O
the	O
Pascal	B-Application
source	O
code	O
in	O
a	O
hard	B-Device
disk	I-Device
crash	O
,	O
and	O
due	O
to	O
the	O
lack	O
of	O
backup	O
,	O
no	O
new	O
"	O
classic	O
"	O
versions	O
have	O
been	O
released	O
since	O
.	O
</s>
<s>
Despite	O
this	O
,	O
and	O
with	O
the	O
author	O
's	O
approval	O
,	O
the	O
Liero	B-Application
community	O
has	O
distributed	O
several	O
altered	O
(	O
or	O
hacked	O
)	O
versions	O
of	O
the	O
game	O
through	O
the	O
LieroCDC	O
,	O
and	O
others	O
.	O
</s>
<s>
In	O
2009	O
,	O
"	O
classic	O
"	O
Liero	B-Application
was	O
officially	O
merged	O
with	O
the	O
OpenLiero	O
project	O
upon	O
the	O
release	O
of	O
Liero	B-Application
1.34	O
(	O
not	O
to	O
be	O
confused	O
with	O
the	O
total	O
conversion	O
by	O
that	O
name	O
)	O
.	O
</s>
<s>
The	O
original	O
Liero	B-Application
data	O
and	O
binary	O
files	O
by	O
Riekkinen	O
were	O
released	O
available	O
under	O
the	O
WTFPL	B-License
license	B-License
.	O
</s>
<s>
Liero	B-Application
Xtreme	I-Application
(	O
often	O
called	O
LieroX	B-Application
,	O
Liero	B-Application
Extreme	O
or	O
just	O
LX	O
)	O
is	O
a	O
2D	O
shooter	O
game	O
.	O
</s>
<s>
It	O
is	O
an	O
unofficial	O
sequel	O
to	O
Liero	B-Application
,	O
and	O
is	O
the	O
most	O
popular	O
of	O
all	O
the	O
Liero	B-Application
clones	O
.	O
</s>
<s>
It	O
features	O
online	B-Application
play	I-Application
,	O
fully	O
customizable	O
weapons	O
,	O
levels	O
and	O
characters	O
.	O
</s>
<s>
Liero	B-Application
Xtreme	I-Application
was	O
created	O
in	O
C++	B-Language
by	O
Jason	O
'	O
JasonB	O
 '	O
Boettcher	O
,	O
an	O
Australian	O
programmer	O
.	O
</s>
<s>
With	O
its	O
source	O
release	O
on	O
April	O
10	O
,	O
2006	O
,	O
a	O
new	O
project	O
has	O
become	O
available	O
on	O
October	O
24	O
,	O
2006	O
,	O
known	O
as	O
OpenLieroX	O
,	O
while	O
the	O
development	O
of	O
the	O
original	O
LieroX	B-Application
project	O
has	O
stopped	O
.	O
</s>
<s>
Liero	B-Application
Xtreme	I-Application
also	O
allows	O
team	O
deathmatches	O
,	O
which	O
has	O
made	O
it	O
common	O
for	O
players	O
to	O
form	O
clans	O
.	O
</s>
<s>
OpenLieroX	O
runs	O
on	O
Windows	B-Application
,	O
on	O
MacOSX	O
,	O
on	O
Linux	B-Application
and	O
on	O
FreeBSD	O
.	O
</s>
<s>
The	O
first	O
release	O
announcement	O
of	O
Liero	B-Application
Extreme	O
was	O
made	O
on	O
October	O
14	O
,	O
2002	O
.	O
</s>
<s>
LieroX	B-Application
has	O
become	O
very	O
famous	O
over	O
the	O
time	O
.	O
</s>
<s>
On	O
February	O
14	O
,	O
2006	O
,	O
Jason	O
Boettcher	O
stopped	O
the	O
LieroX	B-Application
development	O
for	O
good	O
.	O
</s>
<s>
Before	O
leaving	O
the	O
community	O
,	O
he	O
released	O
the	O
source	O
code	O
of	O
the	O
even	O
older	O
version	O
0.55b	O
under	O
the	O
zlib	B-License
license	I-License
.	O
</s>
<s>
As	O
a	O
customizable	O
game	O
,	O
it	O
allows	O
players	O
and	O
developers	O
to	O
script	B-Language
their	O
own	O
mods	O
.	O
</s>
<s>
The	O
default	O
mod	O
is	O
Liero	B-Application
1.0	O
,	O
also	O
called	O
Classic	O
,	O
which	O
is	O
roughly	O
equal	O
to	O
the	O
basic	O
setting	O
in	O
original	O
Liero	B-Application
.	O
</s>
<s>
Similarly	O
to	O
Liero	B-Application
,	O
the	O
default	O
level	O
is	O
Dirt	O
Level	O
,	O
consisting	O
of	O
diggable	O
terrain	O
with	O
some	O
indestructible	O
rock	O
.	O
</s>
<s>
NiL	O
(	O
recursive	O
acronym	O
for	O
NiL	O
Is	O
n't	O
Liero	B-Application
)	O
is	O
a	O
clone	O
of	O
Liero	B-Application
,	O
which	O
runs	O
on	O
Linux	B-Application
and	O
Windows	B-Application
and	O
is	O
released	O
under	O
the	O
terms	O
of	O
the	O
GNU	B-License
General	I-License
Public	I-License
License	I-License
.	O
</s>
<s>
NiL	O
is	O
not	O
limited	O
to	O
two	O
players	O
,	O
like	O
the	O
original	O
Liero	B-Application
is	O
.	O
</s>
<s>
It	O
has	O
support	O
for	O
an	O
infinite	O
number	O
of	O
players	O
over	O
a	O
TCP	B-Protocol
network	O
.	O
</s>
<s>
It	O
was	O
met	O
with	O
considerable	O
enthusiasm	O
in	O
the	O
Linux	B-Application
gaming	O
community	O
.	O
</s>
<s>
The	O
project	O
was	O
initiated	O
by	O
Flemming	O
Frandsen	O
in	O
winter	O
1999	B-Application
after	O
he	O
had	O
stumbled	O
across	O
Liero	B-Application
,	O
which	O
he	O
liked	O
so	O
much	O
that	O
he	O
decided	O
to	O
reimplement	O
it	O
under	O
Linux	B-Application
.	O
</s>
<s>
NiL	O
was	O
dead	O
until	O
the	O
beginning	O
of	O
2004	B-Application
when	O
Christoph	O
Brill	O
,	O
found	O
out	O
about	O
the	O
project	O
and	O
took	O
over	O
as	O
maintainer	O
.	O
</s>
<s>
By	O
mid-2005	O
Alexander	O
Kahl	O
joined	O
development	O
,	O
convinced	O
Christoph	O
to	O
start	O
over	O
and	O
re-think	O
the	O
whole	O
concept	O
of	O
NiL	O
,	O
as	O
the	O
other	O
Liero	B-Application
clone	O
Gusanos	O
already	O
existed	O
at	O
that	O
time	O
.	O
</s>
<s>
OpenLieroX	O
is	O
a	O
remake	O
of	O
classic	O
Liero	B-Application
,	O
built	O
from	O
scratch	O
in	O
a	O
new	O
engine	O
.	O
</s>
<s>
Classic-like	O
Liero	B-Application
clone	O
in	O
web	O
browser	O
with	O
multiplayer	O
capability	O
.	O
</s>
<s>
Liero	B-Application
is	O
a	O
versatile	O
game	O
in	O
terms	O
of	O
modification	O
.	O
</s>
<s>
The	O
images	O
of	O
the	O
worms	B-Application
themselves	O
can	O
be	O
transformed	O
into	O
completely	O
different	O
characters	O
,	O
although	O
their	O
movement	O
animations	O
are	O
less	O
flexible	O
regarding	O
modification	O
.	O
</s>
<s>
The	O
AI	B-Application
can	O
be	O
modified	O
to	O
be	O
harder	O
or	O
easier	O
.	O
</s>
<s>
Nearly	O
the	O
whole	O
game	O
can	O
be	O
converted	O
into	O
something	O
entirely	O
different	O
,	O
except	O
for	O
the	O
main	O
aspect	O
having	O
to	O
do	O
with	O
slaughtering	O
another	O
player/AI	O
.	O
</s>
<s>
In	O
2006	O
Liero	B-Application
received	O
a	O
TopDog	O
award	O
from	O
Home	O
of	O
the	O
Underdogs	O
.	O
</s>
<s>
In	O
2013	O
Derek	O
Yu	O
's	O
webpage	O
TIGSource	O
reviewed	O
Liero	B-Application
v1.36	O
favorably	O
.	O
</s>
<s>
The	O
Liero	B-Application
variants	O
NiL	O
,	O
Gusanos	O
,	O
and	O
OpenLieroX	O
were	O
downloaded	O
multiple	O
hundred	O
thousand	O
times	O
from	O
SourceForge	B-Application
alone	O
between	O
2001	O
and	O
2016	O
.	O
</s>
<s>
Calling	O
Liero	B-Application
a	O
"	O
masterpiece	O
"	O
,	O
Liero	B-Application
was	O
selected	O
for	O
a	O
collection	O
of	O
100	O
classical	O
Finnish	O
games	O
,	O
which	O
were	O
presented	O
on	O
the	O
opening	O
of	O
the	O
Finnish	O
Museum	O
of	O
Games	O
in	O
Tampere	O
in	O
2017	O
.	O
</s>
