The base set has 37 rings. The Gipf Potentials 2 adds 12 more Zertz rings into the mix. However, I've also heard that 61 rings is acceptable (if I'm not mistaken, this would create a symmetrical 5-sided hexagon).
Are there alternate rules or an alternate number of marbles used with these variants, or do I use the same amount of marbles that I would use with the 37-ring base set? The reason why I ask is because if more marbles are used, then the obvious choice would be to pick up a 2nd set of Zertz.