The easiest way is to research into good Alt-coins and invest in them. GAME is up 30%+ just today, for example.
I did this before but finally I faced losses more than what I have booked earlier. Maybe over time I started failing with my researches but till today I could not find exact reasons for my losses. Currently I am not recommending anyone to go investing into altcoin trading.
The main thing is not to start gambling. An investor is less risky than a player. But still there is a risk, because this is a dangerous business
But I am not seeing gambling business a dangerous one for the gambling owner/investors. I guess gambling industry will turn as trillion dollars industry in very near future itself.