What is the ruling on using computer games that contain the sign of the cross on medicine boxes, and how should copies that have been distributed to friends be dealt with?

It is not permissible for a Muslim to use toys that contain elements contrary to the creed of Islam, such as the cross, because this assists in spreading falsehood, distorts the عقيدة (creed) of Muslim children, and promotes the beliefs of disbelievers. Allah the Almighty says: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."