The program Nim Game XL allows to play a wide variety of Nim games, from the simplest one with only one heap up to complex games with dozen or several dozen of heaps. Nim games are strategy games for two players (the program can replace the other player so you can play alone). We have at the beginning heaps (or rows) of objects (which can be matches, tokens, coins ... and why not bricks ...), and one after other the players must remove one or more objects in one heap, until there are no more ob