I’ve heard some are hesitant to take a green at 13 & to that I’d say don’t expect to get many plays for the green. Unless you have been in the casino for several hours & are monitoring how much play the machine is getting, you’re not going to know how many spins until the meters move up. Generally the approach is going to be 12 red, 13 green & 14 blue. Tap on each one to reveal where each meter stands.
This is for what I consider the “standard” version of Progressive Free Games which is the 48/175/600. What to look for & how to advantage play Progressive Free Games.