The idea behind "Stop 'N' Swop" was to do certain challenges/objectives in "Banjo-Tooie," then stop and swap the cartridges while the system was still on. This would have unlocked special items in "Banjo-Kazooie." You can than swap the games again to get the items in "Tooie." This idea was scrapped when the window of time that players could "hot swap" games (the ability to switch games when the power was on) was shortened from 10 seconds to only 1 second. There are still cheat codes that will unlock the special items in Banjo-Kazooie.