The HARDNUMERIC and COMPLEX problems used in the competition do not easily fit into the analysis conducted across the other results. These problems raise interesting special challenges for the planners. We now discuss some of these challenges, presenting data below. Each of these challenges was explored in only one or two problem sets, so generalisations about the performance of the planners based on the data collected are inappropriate. We do not, therefore, perform a statistical analysis of these data, but, instead, present the relevant data in simple graphical form.