<s>
Oxyd	B-Application
is	O
a	O
1990	O
puzzle	O
video	O
game	O
developed	O
for	O
the	O
Atari	B-Device
ST	I-Device
and	O
ported	O
to	O
the	O
Amiga	B-Device
,	O
Macintosh	B-Device
,	O
MS-DOS	B-Application
,	O
and	O
NeXT	O
by	O
Dongleware	O
Verlags	O
GmbH	O
.	O
</s>
<s>
It	O
is	O
a	O
game	O
of	O
puzzles	O
and	O
tests	O
to	O
restart	O
all	O
the	O
oxygen	O
generators	O
(	O
called	O
Oxyds	B-Application
)	O
on	O
the	O
player	O
's	O
home	O
planet	O
.	O
</s>
<s>
The	O
Oxyds	B-Application
must	O
be	O
restarted	O
by	O
opening	O
them	O
in	O
pairs	O
of	O
matching	O
patterns	O
,	O
and	O
(	O
in	O
colour	O
versions	O
)	O
matching	O
colours	O
.	O
</s>
<s>
The	O
Atari	B-Device
ST	I-Device
version	O
was	O
developed	O
with	O
the	O
Megamax	O
Modula-2	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
The	O
player	O
controls	O
a	O
small	O
black	O
marble	O
that	O
rolls	O
around	O
,	O
touches	O
things	O
to	O
activate	O
them	O
(	O
Oxyds	B-Application
are	O
opened	O
by	O
touching	O
them	O
)	O
,	O
and	O
bashes	O
things	O
to	O
move	O
them	O
.	O
</s>
<s>
The	O
player	O
must	O
open	O
all	O
of	O
the	O
Oxyds	B-Application
to	O
progress	O
to	O
the	O
next	O
landscape	O
.	O
</s>
<s>
Oxyds	B-Application
must	O
be	O
matched	O
in	O
pairs	O
.	O
</s>
<s>
An	O
unpaired	O
Oxyd	B-Application
will	O
close	O
if	O
an	O
Oxyd	B-Application
of	O
another	O
pattern	O
or	O
colour	O
is	O
opened	O
.	O
</s>
<s>
The	O
interconnection	O
is	O
accomplished	O
by	O
MIDI	O
on	O
the	O
Atari	B-Device
ST	I-Device
,	O
or	O
by	O
the	O
serial	B-Protocol
ports	I-Protocol
on	O
other	O
machines	O
.	O
</s>
<s>
Dongleware	O
offered	O
for	O
$4	O
shipping	O
and	O
handling	O
the	O
first	O
ten	O
levels	O
of	O
Oxyd	B-Application
,	O
and	O
the	O
game	O
was	O
easily	O
obtainable	O
from	O
shareware	B-License
CDs	O
or	O
bulletin	B-Application
board	I-Application
systems	I-Application
.	O
</s>
<s>
The	O
Oxyd	B-Application
Book	O
was	O
sold	O
separately	O
for	O
$39	O
,	O
with	O
code	O
tables	O
matching	O
the	O
information	O
given	O
on	O
the	O
Magic	O
Stone	O
.	O
</s>
<s>
This	O
form	O
of	O
software	O
protection	O
used	O
the	O
book	O
as	O
a	O
dongle	B-Device
or	O
code	O
wheel	O
;	O
however	O
,	O
unlike	O
other	O
games	O
which	O
use	O
the	O
code	O
book	O
protection	O
approach	O
,	O
the	O
game	O
itself	O
was	O
free	O
.	O
</s>
<s>
Computer	O
Gaming	O
World	O
in	O
April	O
1993	O
called	O
Oxyd	B-Application
"	O
My	O
favorite	O
new	O
shareware	B-License
title	O
...	O
an	O
exceptional	O
offering	O
,	O
guaranteed	O
to	O
provide	O
numerous	O
hours	O
of	O
enjoyment	O
"	O
.	O
</s>
<s>
The	O
magazine	O
in	O
April	O
1994	O
said	O
that	O
Oxyd	B-Application
Magnum	O
"	O
will	O
quickly	O
pull	O
players	O
deeper	O
and	O
deeper	O
into	O
its	O
100	O
devilish	O
mazes	O
"	O
.	O
</s>
<s>
The	O
magazine	O
concluded	O
that	O
"	O
Oxyd	B-Application
Magnum	O
is	O
a	O
top	O
notch	O
puzzle	O
game	O
that	O
will	O
keep	O
players	O
up	O
to	O
the	O
early	O
hours	O
of	O
the	O
morning	O
attempting	O
to	O
solve	O
'	O
just	O
one	O
more	O
level	O
.	O
</s>
<s>
Oxyd	B-Application
spawned	O
a	O
number	O
of	O
sequels	O
:	O
Oxyd	B-Application
Magnum	O
,	O
Oxyd	B-Application
Extra	O
,	O
and	O
(	O
also	O
known	O
as	O
Oxyd	B-Application
2	O
)	O
.	O
</s>
<s>
Additionally	O
,	O
Oxyd	B-Application
itself	O
was	O
a	O
sequel	O
to	O
a	O
lesser-known	O
game	O
,	O
called	O
Esprit	O
.	O
</s>
<s>
In	O
summer	O
2019	O
,	O
Dongleware	O
announced	O
a	O
completely	O
new	O
Oxyd	B-Application
release	O
and	O
a	O
port	O
of	O
the	O
classic	O
version	O
to	O
the	O
Nintendo	B-Application
Switch	I-Application
console	O
.	O
</s>
<s>
Enigma	B-Application
is	O
an	O
Open	B-Application
source	I-Application
fangame	B-Application
with	O
over	O
a	O
thousand	O
different	O
landscapes	O
that	O
can	O
also	O
read	O
the	O
original	O
Oxyd	B-Application
level	O
packs	O
(	O
they	O
are	O
not	O
included	O
for	O
copyright	O
reasons	O
)	O
.	O
</s>
<s>
Mad	O
Data	O
,	O
with	O
the	O
permission	O
of	O
Dongleware	O
,	O
has	O
produced	O
an	O
official	O
freeware	B-License
game	O
with	O
the	O
name	O
"	O
Oxyd	B-Application
extra	O
v2.0	O
"	O
.	O
</s>
