nobody cares about few million nanoseconds similarlythere are times when you can rearrange your code in some way to make it slightly faster by few nanoseconds these tricks also usually make the code harder to read when you consider that several billion nanoseconds have passed in the time it takes you to read this sentencesaving few nanoseconds of execution time in your program won' be noticed by the player summary this hasn' introduced any new pygame programming concepts that the memory puzzle game didn' useaside from using the copy(method of surface objects just knowing few different concepts will let you create completely different games for practiceyou can download buggy versions of the sliding puzzle program from