Engage and retain additional gamers with proven bonus types and mechanics powered by efficiency Evaluation, A/B tests, UX investigate, and surveys.??? ????? ???????? ?????” “???????? ????? ????? ??? ???????? ????????. ?????? ????? ???????? ????? ? ??? ??? ?? ??? ??? ?????? ????? ?? ????? ? ???? ?????? ?????.??? ???? ???? ???? ?? ??? ??? ??????