Source: http://megalextoria.blogspot.com/2014/02/nintendo-power-advance-issue-number-4.html
Nintendo Power Advance was an offshoot of Nintendo Power that exclusively covered the Game Boy Advance. They were more like strategy guides than a typical Nintendo Power issue and were relatively expensive ($14.95). For example, issue four pictured above consisted mostly of nearly a hundred page strategy guide for Super Mario World: Super Mario Advance 2. A rather complicated name for what was essentially Super Mario World for the Game Boy Advance.
Read more: http://www.megalextoria.com/wordpress/index.php/2014/02/25/nintendo-power-advance-issue-number-4/