Build a pen around the horse by placing walls on the grid. Click on a grass (green) tile inside the grid to place a wall. The more grass tiles you trap the horse inside, the higher your score. Each puzzle has a different amount of walls you can use.
Some puzzles have bonus items. If they're inside the pen, they affect your score:
A new puzzle drops every day — everyone gets the same one. You get one submission attempt, so think carefully before you hit submit!
After submitting, see how everyone else scored and view the optimal solution. Past puzzles and community-created levels are available from the menu.