H. P. Sari, A. J. A. Tajuddin, Z. A. Aziz, and L. Isro’iyah, “Enhancing grammar mastery through climbing castle app: A game-based learning for secondary students in Blitar”, Indones. J. Appl. Ling., vol. 15, no. 2, Sep. 2025, doi: 10.17509/ctthnz26.