This research is derived from the results of observations in class 2 of UPT SD Negeri Sumberjo 01 Sanankulon, Blitar Regency. The learning process found low ability of second-grade elementary school students in constructing simple sentences according to the Subject-Predicate-Object (SPO) structure and limited use of interactive learning media in Indonesian language learning. The purpose of this study is to develop the GASPOTA Puzzle media (Subject-Predicate-Object Word Picture) assisted by Book Widgets, determine the level of media validity, and test the effectiveness of its use in improving the ability to construct simple sentences of second-grade students of UPT SD Negeri Sumberjo 01 Sanankulon, Blitar Regency. The study used the Research and Development (R&D) method with the ADDIE model which includes the Analyze, Design, Develop, Implement, and Evaluate stages. The research subjects were 30 second-grade students. The research instruments consisted of validation sheets from media experts and material experts, response questionnaires, and learning outcome tests in the form of pre-tests and post-tests. Data were analyzed descriptively quantitatively and qualitatively, while the effectiveness test used the Paired Sample t-Test assisted by IBM SPSS. The results of the study showed that the GASPOTA Puzzle media assisted by Book Widgets obtained a very high level of validity. The validation of media experts obtained a percentage of 100% with a very feasible category, while the validation of material experts obtained a percentage of 90% with a very feasible category. The results of the implementation showed an increase in students' ability to construct simple sentences, indicated by an increase in the total score from 1,795 in the pre-test (mean 59.83) to 2,490 in the post-test (mean 83.00) with a difference of 695. The results of the Paired Sample t-Test showed a significance value of Sig. (2-tailed) of 0.000 < 0.05, which means there is a significant difference between the pre-test and post-test results. Thus, the GASPOTA Puzzle media assisted by Book Widgets is proven to be valid, feasible, and effective for improving the ability to construct simple sentences of second-grade elementary school students. ABSTRAK Penelitian ini dilatarbelakangi oleh hasil observasi di kelas 2 UPT SD Negeri Sumberjo 01 Sanankulon, Kabupaten Blitar. Proses pembelajaran menunjukkan rendahnya kemampuan siswa sekolah dasar kelas dua dalam menyusun kalimat sederhana sesuai dengan struktur Subjek-Predikat-Objek (SPO) serta penggunaan media pembelajaran interaktif yang terbatas dalam pembelajaran Bahasa Indonesia. Tujuan penelitian ini adalah untuk mengembangkan media teka-teki GASPOTA (Gambar Subjek-Predikat-Objek Kata) yang dibantu oleh Book Widgets, menentukan tingkat validitas media, dan menguji efektivitas penggunaannya dalam meningkatkan kemampuan siswa kelas dua UPT SD Negeri Sumberjo 01 Sanankulon, Kabupaten Blitar dalam menyusun kalimat sederhana. Penelitian ini menggunakan metode Research and Development (R&D) dengan model ADDIE yang mencakup tahap Analyze, Design, Develop, Implement, dan Evaluate. Subjek penelitian adalah 30 siswa kelas dua. Instrumen penelitian terdiri dari lembar validasi ahli media dan ahli materi, angket respon, serta tes hasil belajar dalam bentuk pretest dan posttest. Data dianalisis secara deskriptif kuantitatif dan kualitatif, sedangkan uji efektivitas menggunakan uji paired sample t-test dengan bantuan IBM SPSS. Hasil penelitian menunjukkan bahwa media puzzle GASPOTA berbantuan Book Widgets memperoleh tingkat validitas yang sangat tinggi. Validasi ahli media memperoleh persentase 100% dengan kategori sangat layak, sedangkan validasi ahli materi memperoleh persentase 90% dengan kategori sangat layak. Hasil implementasi menunjukkan peningkatan kemampuan siswa dalam menyusun kalimat sederhana, yang ditunjukkan oleh peningkatan skor total dari 1.795 pada pretest (rata-rata 59,83) menjadi 2.490 pada posttest (rata-rata 83,00) dengan selisih 695. Hasil uji paired sample t-test menunjukkan nilai signifikansi Sig. (2-tailed) sebesar 0,000 < 0,05, yang berarti terdapat perbedaan signifikan antara hasil pretest dan posttest. Dengan demikian, media puzzle GASPOTA berbantuan Book Widgets terbukti valid, layak, dan efektif untuk meningkatkan kemampuan menyusun kalimat sederhana siswa kelas dua sekolah dasar.
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