Type @roulette to open up the game window.
To start requires 1 Bronze Coin, this will unlock the first two rows.
Bronze Coin drops from all mobs at very low rate.
To unlock the next three rows requires 10 Silver Coin, and the final two rows requires 10 Gold Coin
Silver and Gold Coin can only be obtained from the minigame itself.
With the proper amount of coins in inventory, click on the Start button to activate the cursor that will cycle through the prize icons. If the cursor lands on an item, you have the option to Get Prize or Start to spin on the next row for slightly better rewards. If the cursor lands on the first item to the far left, you can only Get Prize and you must spend more coin in order to play again.
http://wiki.jellyro.com/index.php/Lucky_Roulette