Spatial ability is considered essential in learning many disciplines. Studies have shown that providing students with geometry learning activities would help them develop spatial ability. Augmented Reality (AR) provides a combination of real and virtual worlds and allows students to view the spatial relationship of real world objects that is impossible to be implemented in traditional textbooks. This study have two purposes: (1) to develop an augmented reality system to assist students solve the Rubik's cube and learn the geometry concepts of volume and surface area, and (2) to examine the effects of using the system in terms of students' improvement on spatial ability, geometry achievement, and attitudes toward learning. The system is still under development and the evaluation is yet to be done.