NR (NumberRoyale) Trainer improves your number sense. You benefit in two ways with NR Trainer: first, it improves your numeracy and second, it gives you sample puzzles for you to train.
NR Trainer has unlimited number puzzles for integers, fractions, decimals and algebra.
NR Trainers has been shown to improve standardized math test scores: 100 minutes of game play has been shown to improve math standardized test scores by almost 50% of what can be gained during an entire school year!!!
Results of statistical study can be found in the URL https://www.numberroyale.com/content/images/DCASAnalysisReport.pdf