Cross Number 对比 Prime number girls collection 的使用情况和统计数据

Cross Number is a fun and educational game. The goal of Cross Number is to match the series of numbers in each row and column to the total found at the each of the respective rows and columns. Touch and drag a number from one cell to another to swap them (or you can touch one, then touch another to swap them). Three rounds of 4x4, 5x5 and 6x6 test your ability to solve the puzzle quickly. The quicker you complete the round the higher your score.