Use arrow keys, WASD, or tap the background to move across the map. To lift the boxes and check for Happy Ones, click them or press the space bar (make sure that the Cat is touching the box first). If there is a Happy One inside, they will join you and follow you around as you collect other Happy Ones. This game does not have a goal. Maybe one day there will be a version with a goal, but for now, enjoy wandering aimlessly and collecting Happy Ones.
The Cat is from another project of mine, 'Catwalk'. The hands of the Happy Ones are from another project that I have not posted. To make the hands, I imported a picture of my human hands and traced them in Scratch Default Purple(?).