How to play

1. Walk the crab with the arrow keys, by swiping, or by tapping beside it.
2. Walk into a shell or pebble to push it. You can push one thing at a time, never pull.
3. Anything pushed into the pool keeps sliding until it reaches sand or hits something.
4. Get the striped whelk into the hollow. Par is the fewest moves it can be done in.

A new pool comes in every day at midnight. Monday's are gentle; by Sunday it is a spring tide.