Tumblestone

Completing level 20 in the 1st world you gain a star and a new level appears in the map, linked to level 1-16. When you start this level, a pop-up appears and with you can change the difficulty.

This can be done early on after completing puzzle 1-20. This will unlock the first practice puzzle in the game, located above puzzle 1-15 on the map. Make sure to set the practice puzzle's difficulty to three stars. Complete a three star practice puzzle and the achievement / trophy is yours.

Here is a video guide with English commentary for this achievement!


Here is a playlist of guides for this game!

https://www.youtube.com/playlist?list=PL-HeW6XkKdUIM9EoxUzMX...