Do you know popular title called Counter-Strike: Global Offensive? Well then this game should be interesting for you!
This game simulates case opening from that title, its clearly the most accurate one you can find.
On the main screen you see all the cases, for example Chroma Weapon Case or Sticker Capsule 1. You can choose any of them to open, or just check your already won items by pressing "Inventory" button. In inventory you can sell the items you have and check the blance. On the case opening screen, upper screen shows you all items that this case has, items that are possible to win. If you press "Open the case" (or something similar, its random) then you can see many weapons or stickers passing by and the one that stops in the middle is yours. The winning screen shows Steam prices, if the weapon is StatTrak or not and options how to save the weapon. If you press "Accept", the item will be deployed in your Inventory. Under inventory you can choose up to 10 same type weapon and trade them up for higher one.