The study aimed to determine the benefits of Project OSO: Online, Shareable, and Offline videolectures to seventh-grade students during the Flipped Classroom implementation to resolve theuntaught mathematics learning competencies before the school year ended. The study employed theexperimental research design with three groups. Using the cluster random sampling technique, thesethree groups were selected from the seventh-grade population as respondents and were randomlyassigned with the three proposed interventions named Project OSO. These three groups underwentthe same set of questionnaires as pre-test and post-test before and after the interventions. These 40-item multiple-choice research instruments were evaluated, reviewed and quality assured by anexpert panel of evaluators using the conducted pilot testing and the generated Cronbach alpha index.The study's findings revealed that learners' test scores differed significantly among the three groupsbased on one-way ANOVA. However, the Tukey post hoc test showed that the Flipped Online groupdiffered substantially from the Flipped Shareable and Offline groups. Consequently, Project OSOwas considered a valuable resource in the Flipped Classroom implementation and highlyrecommended for instructing learners when the teacher was out due to school-related functionsamong these three video lectures platforms. These platforms were the flipped online, flippedshareable, and flipped offline video lectures that the learners could probably learn at their own pace,anytime and anywhere