Aboard a ship called the Wisconsin, kids solve math, spelling and trivia challenges by signing the answers, and the webcam reads their hands to check. Hand recognition runs entirely on the device — camera video is never recorded or uploaded. The handshapes are real ASL letters and numbers, though simplified for play (a two-digit answer is signed digit by digit, not the proper ASL way); the game calls itself a doorway, not a class. Free, built for ages 5 to 11.