does it cost gems to get an extra coop slot

I invested real money in gems to buy slots because I thought that would really improve my game BAD investment Once you buy a slot,

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extra slot modern sonic in Lakeside, CA Gems Gems Gems Slot

extra bonus slot 200% Mine went back to 25 as well I like better the 35 gems slot, that way I won't buy one by accident, since I use my 24 gems in a box as soon