Euclidea 2.8 3e

To understand the brilliance of the 3E solution, one must first understand the constraints. In Euclidea, an "E" (Elementary) move is defined as the use of a specific tool: a point, a line, a circle, or the goniometer (angle tool). The level provides a given segment, let's call it AB, and asks the player to construct a square using AB as one of its sides.