how do i unlock em yo, i unlocked one after a game it said "u have unlocked a slot " or something like that i thought only the expansion slots unlocked em?
Yes you do need a expansion slot to obtain a new row, but you need a certain amount of exp to unlock each box.
I think it's 5K exp (i don't remember exact amount) to unlock the 2nd row of 5 slots each. For the last 5 slots you need to have a Skill Book Expansion Kit to unlock each slot
Top row of 5 is unlocked from the start. Middle row of 5 is unlocked by gaining EXP. Each one has a specific amount needed, but the grand total is 200,000 EXP needed to unlock all 5. Bottom row of 5 is unlocked by purchasing Expansion Kits from the shop, 5 total are needed.
This is probably too late but if you're attempting with the gem crate RNG, best of luck get better drops than I did
You can either unlock the second row by purchasing expansion kits, or you can just farm EXP for them. The third row must be unlocked via expansion kits, however.