Is the Sea Turtle the hardest animal layout?

It is the largest at 144 tiles and the longest to solve, but its difficulty is rated 3 out of 5, the same as several other animals. The size makes it demanding mainly because the heavily stacked shell requires careful pacing, not because any single moment is especially tricky.

What is the best opening on the Sea Turtle?

Clear the four flipper tips and the head first. They are all exposed, they give you matches in every direction, and removing them peels the figure inward toward the shell where the hard tiles are concentrated.

How do I clear the patterned shell without getting stuck?

Work it in layers from the outer ring toward the crown, always taking the top layer first. Avoid digging a hole in the middle, and keep a pair or two in reserve as you finish the flippers so you have options when you reach the dome.

Does the large tile count make it always solvable?

Yes. Like every board, the Sea Turtle is generated by working backwards from a completed solution, so a full clear always exists regardless of size. If your order of moves dead-ends in the shell, Shuffle re-deals the remaining tiles into another solvable arrangement.