Rather than masking geometry problems behind some sort of abstracted game puzzle-story (as in, for instance, Boppin'
or Puzzle Bobble
) this game lays it all out bare, as its woodworking author might with a piece of lumber out on the drill press, and urges the player to take a look and estimate (otherwise put, "eyeball") the proper modifications required to make a mark on-screen conform to various geometrical demands made of the player, including such thrilling mini-games as: pulling two sides of a quadrilateral to make it a parallelogram, finding the mid-point of a line segment, bisecting an angle, marking a point in a scalene triangle equidistant from all sides, marking the precise centre of a circle, making a right angle and marking the projected convergence point of three incomplete lines.
The operations are conducted through a one-click mouse interface... like in a chess game, you can pick up the marker and move it around as much as you like, but upon releasing the click, the mark has been made and can't be gone back on. Allowing for statistical anomalies, however, the game runs the player through all puzzles three times and then calculates the average inaccuracy... then compares it to other players!