Crash, roulette, dice and slots. You can win instant profit BUT that is if you're lucky to win. Most gambling games are luck based hence you cant expect to win in these games if you're not lucky. So gamble with less expectation and in moderation. If you're not prepared to lose then dont gamble, because the chances to win depends on the game that you'll play (since there's a chance based and skill based) and of course luck.