I've built a menu with 20 links aprox. Then I put the block drupal creates for my menu on a region. Thing is I want some of the links to show for some pages, while others are hidden, like the option called "visibility options" on admin/structure/block/manage/block/nodenumber/
i.e.: links 1,2 and 3 should be visible on page node/1 links 1,3 and 5 should be visible on page node/2 links 3,5 and 6 should be visible on page node/3
Any advice on how can I make it possible?
NOTE: Sorry for my english but it's not my native tongue.