Operate four random integers [1..13] with +,-,*,/ operators so that the end of result is 24. Features with displaying the problem difficulty, timer, providing one of answers.
平衡免費
西部大盗侠
腐烂的后果营救幸存者
标志认识
宝宝学校生活
西游小精灵
英雄意志HeroesWill
生化之战