Pick the same animal every time, so your stickers stay together. Sharing this device? Each person picks their own.
Picture and word puzzles to give little brains a big workout. Pick a level and a puzzle, then tap an answer to check it.
Keep it safe. Progress lives only in this browser. Save a copy now and then, so clearing the browser or changing tablets doesn't lose any stickers. On iPhone and iPad, Safari can clear a site's saved data if it isn't used for a while; adding Puzzle Puffin to the Home Screen helps too.