What is confirmed about items?
The official Roblox experience describes a simple loot loop: toss coins into a magic fountain, receive loot, sell that loot for cash, and use upgrades to improve future attempts. It also says that more luck leads to better loot. Those points explain how items fit into progression, but they are not a complete inventory or drop table.
The same official description makes one unusually specific rarity claim: the rarest item is listed at 1 in 20 quadrillion. The selected official source does not identify that item by name or explain whether luck, coin type, or World 3 changes those odds. We preserve the claim exactly at that level and do not reverse-engineer missing numbers.