moderately significantp = 0.004
We observed a moderately significant positive Spearman's correlation between the time taken to solve the puzzle and the self-reported engagement ( r = 0.40 , p = 0.004), and a moderately significant positive Spearman's correlation between the total time taken to solve the puzzle and self-reported effort ( r = 0.40, p = 0.004) ( Figure 3 ).