Unblock It: Atlantis is a 3D sliding puzzle: blocks sit on a cube with arrows showing which direction each can move, and any block not obstructed can be slid away. Clearing the whole cube is the goal.
Rotation is essential rather than cosmetic — some paths are hidden from your current angle, so turning the cube is part of solving rather than just looking. There are no move limits, which makes it a genuinely relaxed puzzle.
Because some blocks' paths are hidden from your current viewing angle. Rotating isn't cosmetic — it's how you find the next legal move.
No — it's designed as a calm, unlimited puzzle, which is unusual and welcome in the genre.
Yes — swipe blocks and drag to rotate. Nothing to install.