Just plane logic
Here's a puzzle I first saw in Pickover's Wonders of Numbers:
I like this one because there aren't any tricks and the task is possible. It came to mind as I came across a game called 3D Logic:
Here we have some pillars in a room. Some of the pillars are touching the walls. You must connect corresponding pillars (1-I, 2-II, 3-III) without crossing paths or leaving the box.
I like this one because there aren't any tricks and the task is possible. It came to mind as I came across a game called 3D Logic:
