Rule referrence: sbr

During initial discard of 3 tiles, not able to select tiles from multiple suits. Please fix.

It's meant to be the same suit. I learned this on some mahjong app and some Chinese webpages, like here

The only rule is you have to get rid of all the voided suit tiles first. As currently implemented, if I want to void a suit I have 2 tiles of, I can't get rid of those tiles, because there aren't 3 of them. I should be able to declare that suit, cut those 2 tiles and 1 tile of another suit.

that is the rule. if you have only two tiles in one suit, u cannot void them.