However , the Amstrad release exclusively displayed dual - colours .
As with its predecessor , the Stamper brothers developed the game in monochrome to avoid visual overlay and attribute clash , as it was a common processing limitation in early 8 - bit consoles .
The Amstrad release exclusively displayed dual - colours .
As with its predecessor , the Stamper brothers developed the game in monochrome to avoid visual overlay and attribute clash , as it was a common processing limitation in early 8 - bit consoles .