Use APKPure App
Get Merge Cubes old version APK for Android
Try it, and you won't quit until get this "F" tile!
Drag tiles with same number to each other, to merge them and get tile with bigger number, and try to get tile 15. Sounds simple? Try it yourself!
This entire game was made for youtube video, you can watch how it was created here: (russian voice, english subtitles) https://youtu.be/yzOk5lGxztU