Figure 3
From: Error and attack tolerance of collective problem solving: The DARPA Shredder Challenge
Puzzle characteristics and crowd performance statistics. Pieces is the number of pieces in a puzzle, edges is the number of correctly assembled edges - which correspond for the first three puzzles the minimum number of edges required to solve the puzzles, moves is the total number of moves, span is the difference in time between the last and first move on a puzzle, man hour column is the cumulative total number of hours spent on the system collectively by the users, users is the total number of users participating in a puzzle, users >0 is the number of users which assembled at least one correct edge. The last two rows describe two separate periods of Puzzle 4: before (4b) and after (4a) the attacks.