I am very confuse about what they call the gambling a game >.< its about spending money on nothing then why is it called a game? why don't call it money investment? kindly explain please? Thank you 
They call it a game because while you are putting your money at stake in it you also get a fun from it,
And try to think about what a gambling looks like, it is a game, poker is a game, race is a game, sports is a game, right,
Sor how come that it will become investment at all.
Yeah you are investing money in it but still it is a game.