This study aimed to develop an evaluation instrument based on the Four-Tier Gamified Diagnostic Test (FT-GDT) to identify students’ misconceptions regarding the General Guidelines for Indonesian Spelling (PUEBI). The instrument consisted of 25 multiple-choice items with five answer options for the first and third tiers, and two confidence options (“confident†and “not confidentâ€) for the second and fourth tiers, producing 100 items in total. The development employed a Research and Development (R&D) approach adapted from Borg and Gall. Expert validation indicated high feasibility, with average scores of 86.7% from subject matter experts and 88.3% from media experts. Empirical validity testing showed that most items met the required criteria (r ≥ 0.254), while reliability testing with 40 students produced a Cronbach’s Alpha of 0.87, indicating strong internal consistency. Misconception analysis revealed that students’ misconceptions ranged from 17.5% to 45%, with many students expressing high confidence in incorrect answers. These findings demonstrate that the misconceptions were conceptual rather than merely technical errors. Overall, the FT-GDT instrument proved effective in identifying misconceptions in PUEBI learning, highlighting its potential as a diagnostic and formative evaluation tool in higher education.
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