<s>
Rigel	B-Application
's	I-Application
Revenge	I-Application
is	O
a	O
text	O
adventure	O
published	O
in	O
1987	O
for	O
the	O
Amstrad	B-Device
CPC	I-Device
,	O
Commodore	O
64	O
,	O
and	O
ZX	B-Operating_System
Spectrum	I-Operating_System
home	O
computers	O
by	O
Mastertronic	O
on	O
their	O
"	O
Bulldog	O
"	O
label	O
.	O
</s>
<s>
It	O
was	O
written	O
by	O
British	O
studio	O
Smart	O
Egg	O
Software	O
using	O
a	O
heavily	O
modified	O
version	O
of	O
The	B-Application
Quill	I-Application
,	O
an	O
adventure-authoring	O
package	O
.	O
</s>
