What is a bet builder?

They're a combination of markets for the same match. Unlike accumulators (where you can choose multiple markets for many matches), bet builders are strict to the same match. You can choose your favorite markets (such as Match Result, Half Time Result, Total Over/Under) for one match.

Which sports can I place a bet builder on?

Bet builder options are available for most pre-matches on basketball, tennis, rugby union, American football, MLB baseball, NHL ice hockey, and IPL cricket matches. Please note that not all matches will have the bet builder function available.

How can I tell if it is available?

When clicking on a pre-match game, you'll check the bet builder option right below the Live View/Stats option, as shown in the image below:

For you to start placing your bet builder, you'll have to activate it in the market button above.

After the option is selected, the bar will be blue, and then it's time to select your preferred markets for this match as the Build Mode will be activated. See an example below:

At the bottom of the page, you'll be able to check the "Bet Builder [X]" with the amount of markets selected. Simply click the option at the bottom, and then you can add it to your bet slip.

Note that, if you're using a bet builder voucher, you'll have to delete other selections from your bet slip before adding the voucher.

What happens if one of the selections is void?
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Unlike accumulators (multiple selections of different matches), where once a selection is voided the odds are recalculated, on a bet builder the entire bet is void if one of the selections is void for any reason.
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Bet builder can't be used combined with other selections, so it's not possible to combine a bet builder with other matches/selections.