The whole board is here: the numbers, the columns, the dozens, red and black, odd and even, and the outside bets around the edge. Pick a chip value, place as many bets as you like across the layout, and spin. Payouts follow the actual table, which means the house edge is in there too.
There is no story and nothing to unlock. What there is is the layout itself, which is worth ten minutes of anyone's time to understand: covering a third of the board and still losing, or splitting a bet across four numbers and watching it land next door, teaches more about the game than any explanation would. The chips are free, which is the only sensible way to learn it.