What's It Like?
*Numbers League* is a math practice app that revolves around an exciting superhero mission. Villains (creatures, not humans) are roaming the town, and number heroes must capture them by matching combinations of numbers to each villain's Kryptonite-like digit that renders them powerless. The baddies land in jail in this completely non-violent superhero vs. bad guys game. In the practice round tutorial, kids create their personal hero and begin to understand how the game works. Another tutorial option simply explains the game in text and images. The practice round is highly recommended, especially for kids at the younger age recommended for this app. Kids can play solo or take turns with some of their classmates, each of whom (up to four) can have their own superhero avatar.

Kids make a hero by combining superhero head, body, and feet sections, where each part has a certain numerical value. A full compiled hero's value is the sum of its body parts, and they'll attack villains with the same number. Different strategies throughout the process can be used to attain the villain's target number, such as adding multiple heroes' sums. There are also "simple devices" that can be attached to the heroes to give them extra mathematical abilities.

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Is It Good For Learning?
Playing the game, younger kids practice basic arithmetic and mental math. Older kids can play a more challenging game including negative numbers and multiplication, depending on which level is chosen (1-5). Once kids understand the game, *Numbers League *is so much fun that kids revel in practicing math to rid the city of its villain problem. As a result, they're learning an even bigger math lesson: that using numbers can solve real-life problems (even though in this game the "real life" problems involve masked superheroes and silly bad guys).

Each round begins with a newspaper showing the player's name in its headlines with a motivational caption. Players tap on that headline to start and create heroes to defeat villains. The levels progress in difficulty so that by the last level, players are using sophisticated math skills to defeat the baddies. Kids must use logic to figure out which new heroes to build, because they can only carry seven heroes at a time within the game. When kids have captured all the villains, the game is over. This sounds a lot more complicated than it actually is; however, it's crucial that kids read the traditional tutorial or play the interactive tutorial (recommended method) before playing the game the first time. There are also many explanation tabs throughout the game and hints if a kid gets stuck.

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