Ok, here we go:
-explode the armed slig( get some granades at the leftmost screen)
-explode the security orb
possess and kill three of the four crawling sligs.
-Possess the fourth crawling slig and use him to press the big green button to open the barrier( press -UP-)
...and voilá!!!
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[ May 04, 2001: Message edited by: Lampion ]