The puzzle above is the At the Beach pack — a day by the sea. It draws on a list of 57 beach words, and every level deals a fresh grid from that list, so the pack does not run out after a handful of puzzles. No timer, no signup, nothing to install.
Every word below can turn up in a grid:
Grids start small and words run across and down only, so the first few levels are an easy sit-down. Later levels grow, but this pack never gets frantic.
Drag across the letters to mark a word — press on the first letter and release on the last. Words can run left to right, top to bottom, diagonally, and backwards. Found words are struck through in the list, and your progress on a grid is saved as you go, so you can stop mid-puzzle and pick it up later.