Online rummy has been declared 100% legal by the Honorable Supreme Court of India, as it is a game of skill and not a game of chance. The outcome of games of skill such as rummy depends on the skill and experience of the player, rather than on external factors such as luck or chance. Therefore, it is absolutely legal to play rummy online for cash prizes and also for free, so you can put aside all your apprehensions about the legality of the game! Some states do not allow real money gambling online, so certified rummy apps do not offer cash games or tournaments in those states.