As mazes are typically complex, cluttered stimuli, solving them is likely limited by visual crowding. Thus, several aspects of the appearance of the maze - the thickness, spacing, and curvature of the paths, as well as the texture of both paths and walls - likely influence the performance. In the current study, we investigate the effects of perceptual aspects of maze design on maze-solving performance to understand the role of crowding and visual complexity. We conducted two experiments using a set of controlled stimuli to examine the effects of path and wall thickness, as well as the style of rendering used for both paths and walls. Experiment 1 finds that maze-solving time increases with thicker paths (thus thinner walls). Experiment 2 replicates this finding while also showing that maze-solving time increases when mazes have wavy walls, which are likely more crowded, rather than straight walls. Our findings imply a role of both crowding and figure/ground segmentation in mental maze solving and suggest reformulating the growth cone models.