You can access all project files from this link:

https://github.com/OakAcademy/Kotlin-Programming-Course
https://github.com/OakAcademy/android-app-development-with-kotlin

https://github.com/OakAcademy/math-game-according-to-three-game-activity-with-kotlin

https://github.com/OakAcademy/math-game-with-one-game-activity

https://github.com/OakAcademy/accessing-feature-of-android-device

Flag Quiz App:
https://github.com/mehmet-ongel/android-kotlin-flag-quiz-with-sqlite

Photo Album Application:
https://github.com/mehmet-ongel/android-kotlin-photo-album-app

Firebase User Registration App:

https://github.com/OakAcademy/firebase-register-user-app-with-kotlin

Firebase Quiz Game App:

https://github.com/OakAcademy/quiz-game-app-with-firebase-kotlin