FileLight.com

24 game program with perfect irrelevant solutions under standard rule (+,-,*,/) and advanced rule (+,-,*,/,^,^^). You can check all irrelevant solutions for any one or all questions. It supports training, test and comments on multiple solutions for one question by setting "Difficulty Level"; supports training plan / training game with instructions and variety of options; supports World Cup in 4 levels; and supports personal collection management.