<s>
Sonic	B-Application
's	I-Application
Ultimate	I-Application
Genesis	I-Application
Collection	I-Application
(	O
Sega	B-Application
Mega	I-Application
Drive	I-Application
Ultimate	I-Application
Collection	I-Application
in	O
PAL	O
regions	O
)	O
is	O
a	O
compilation	O
of	O
video	O
games	O
developed	O
by	O
Backbone	O
Entertainment	O
and	O
published	O
by	O
Sega	O
for	O
PlayStation	B-Operating_System
3	I-Operating_System
and	O
Xbox	B-Operating_System
360	I-Operating_System
.	O
</s>
<s>
The	O
compilation	O
features	O
48	O
Sega	O
games	O
(	O
49	O
counting	O
two	O
versions	O
of	O
Altered	B-Application
Beast	I-Application
)	O
which	O
were	O
previously	O
released	O
for	O
the	O
Sega	B-Operating_System
Genesis	I-Operating_System
(	O
including	O
most	O
of	O
the	O
Sonic	B-Application
the	I-Application
Hedgehog	I-Application
titles	O
released	O
for	O
the	O
system	O
)	O
,	O
arcades	O
and	O
the	O
Master	O
System	O
.	O
</s>
<s>
It	O
is	O
the	O
sequel	O
to	O
the	O
Sega	B-Operating_System
Genesis	I-Operating_System
Collection	O
released	O
previously	O
for	O
the	O
PlayStation	B-Device
2	I-Device
and	O
PlayStation	B-Operating_System
Portable	I-Operating_System
,	O
but	O
contains	O
16	O
(	O
in	O
NTSC	O
regions	O
)	O
more	O
games	O
(	O
including	O
unlockable	O
extras	O
)	O
.	O
</s>
<s>
†	O
Previously	O
available	O
in	O
Sega	B-Operating_System
Genesis	I-Operating_System
Collection	O
.	O
</s>
<s>
†	O
Previously	O
available	O
in	O
Sega	B-Operating_System
Genesis	I-Operating_System
Collection	O
.	O
</s>
<s>
According	O
to	O
Ethan	O
Einhorn	O
,	O
the	O
producer	O
for	O
the	O
collection	O
,	O
the	O
three	O
"	O
lock-on	O
"	O
games	O
(	O
Knuckles	O
in	O
Sonic	B-Application
2	I-Application
,	O
Sonic	B-Application
3	I-Application
&	B-Application
Knuckles	I-Application
,	O
and	O
Blue	O
Sphere	O
)	O
were	O
not	O
included	O
citing	O
"	O
tight	O
development	O
times	O
"	O
,	O
and	O
that	O
including	O
them	O
would	O
have	O
meant	O
"	O
dropping	O
several	O
titles	O
from	O
the	O
collection	O
altogether	O
"	O
,	O
specifically	O
the	O
aforementioned	O
nine	O
unlockable	O
games	O
since	O
"	O
they	O
all	O
required	O
unique	O
emulation	O
solutions	O
"	O
.	O
</s>
<s>
Sonic	B-Application
's	I-Application
Ultimate	I-Application
Genesis	I-Application
Collection	I-Application
received	O
"	O
generally	O
favorable	O
"	O
reviews	O
,	O
according	O
to	O
review	B-Application
aggregator	I-Application
Metacritic	O
.	O
</s>
