In games, you will be able to play in demo mode also and it won't cost you a dime to do that.
But in gambling, you will need to play safe as you are betting your real money behind the games and if you are unlucky, you might lose and losing real money hurts.
If you just play games then money is not involved what so ever it only becomes gambling when you are going to decide to take a gamble and put money on it. You can also play gambling games like poker without using real money to me then it is just s game.
Only when the real money or something that you can comes in to it, it will turn in to gambling.