Extra Odds is a type of campaign which an event bet odds is presented to you higher than usual.
For example, if an bet with a rate of 1.50 is offered to you as an extra odds campaign as 10.0, you can make your bet with this special rate. The maximum amount you are able to bet may vary depending on the campaign conditions. The extra income you earn will be credited to your account as a bonus.
Let's say you bet on a match of 10 TL with real money in your account, with an extra odds of 10.0 instead of 1.50 and you won. In such a case, 10 x 1.50 = 15 TL money and 10 x (10-1.5) = 85 TL bonus will be credited to your account.