Polycubes are made from cubes that are glued face-to-face without overlap.
In polycube puzzles the player is usually presented with a set of such polycubes and he has the task to use then to assemble them to a certain shape.
Sometimes (especially when polycube puzzles are played on the computer) the cubes will be represented by other tokens.
... course of the Zambesi, discovered Lake Nyasa
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Fernão de Magalhães, (Ferdinand Magellan, sea explorer)
Ferdinand Magellan, (c. 1470-1521), leader of first expedition ...