This study investigated the effect of using project-based learning (PBL) through the Madrasati Platform on third-grade secondary students' mathematical achievement, problem-solving skills, and attitudes towards mathematics in a public school in Saudi Arabia. The experimental group received PBL instruction, while the control group received traditional instruction. Pre- and post-tests and surveys were used to assess the groups. Results indicated that the experimental group had significantly higher scores on the mathematical achievement and problem-solving skills tests and more positive attitudes towards mathematics than the control group. The study concludes that PBL through the Madrasati Platform can effectively enhance mathematics education and highlights the need for further research on technology-based platforms.