i am in the process of doing a Sokoban clone as another of my tutorial projects as well as a full game.
The full game will have a 'Select Level' screen utilizing one of my previous projects ......[size=78%]https://enigma-dev.org/edc/games.php?game=88
However, this will be slightly different. A thumbnail will represent each level which, makes coding for me easier to do. This involves taking a screenshot of each level, cropping it to a custom size of 96X96 pixels as a sprite, then simply duplicating that object and changing its sprite_index