It seems that this one is the first one that really works. I was skeptical at first, because I have tried some cheats for other games, but they were all fakes. It is a free online generator that generates free and infinite Credits for Classic Slots. I started looking for some cheats and after a while I found this really cool Classic Slots hack. I thought that maybe there is another way than paying for them via microtransactions or grinding hard for hours.
A few days ago I was playing Classic Slots and I was frustrated because collecting Credits is so damn hard for me.