You do this by changing the direction a path goes in order to sneak past a guard for example. (theswitcheffect.net)
There are a few simple inventory object puzzles scattered throughout each level, but the real challenge is plotting your way past guards and other enemies. (slickstermagazine.com)
These tools can usually complete objectives for the player, which opens up new possibilities for navigating the missions, providing you can get the drones past the guards. (nonfictiongaming.com)