Figure 10

Progress and user flow in Puzzle 4. The first three panels represent the time series of the cumulative progress (black) and absolute value of instantaneous exploration (red) in Puzzle 4, plotted on the same scale, from top to bottom and left to right: (a) across the whole span of the solving, (b) during the section s1, as indicated in blue in the first panel (spanning from the start of the puzzle to before first rollback) and (c) during the section s2 (spanning between two rollbacks). The lower right panel (d) also corresponds to the section s2 and is the smoothed time series of users first moves (blue) and last moves (red). Spans of reported attacks are indicated in shaded orange area.