Question: why are dice games haram?
Answer: Abu Dawood (4938) and Ibn Maajah (3762) narrated from Abu Moosa al-Ash'ari that the Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Whoever plays with dice has disobeyed Allaah and His Messenger.” ... So primarily it's a form of entertainment that Allah forbade for Muslims as mean to test us.