A typical feature of the final leg is what is unofficially dubbed the "Final Memory Challenge" - a challenge (either "Route Info" or a "Roadblock"), an often elaborate challenge which tests the contestants on their time spent during the race, with common examples including memory-based tasks based on their observation skills (such as finding items related to the race which they encountered along, usually in sequential order) and knowing how well they understand their partner or the other teams, or any tasks relating to the theme of the journey they have taken (such as completing a puzzle of the world) or the final leg (such as counting poker chips amounting to representing the grand prize). While the first instance of a memory challenge was in the third American season, it had become a larger trend beginning with ninth American season - with most subsequent seasons (both of the American edition and international versions) including at least one Memory Challenge, which typically appears as the second-to-last or last challenge before reaching the Finish line. In a few recent seasons, a minor version of a memory challenge may also appear in legs towards the end of the race, usually either in the second or third to last leg.