Logic Grid Puzzles offers a monthly subscription on the "Unlimited" tab, which gives you access to 10,000 puzzles in the full range of difficulties. You can play and replay them as much as you like and cancel at anytime (you'll continue to have access until your subscription period ends).

We encourage you to stop and start your subscription based on your needs. The app will remember which puzzles you've already solved so you won't see them again when you restart.