There are plenty of items to collect in Another Crab's Treasure, but the game doesn't tell you how to use them. This includes the rare but incredibly useful Purple Crystals that you can get from ore deposits and boss enemies.

The currency is useless for most of the early game, but you shouldn't ignore it. If you see purple ore nodes, break them. Also watch out for enemies with a purple glow on their head, as these creatures also drop purple crystals.

So, what exactly are Purple Crystals used for in Another Crab's Treasure? And why are they so important to collect?

You'll need Purple Crystals to unlock new abilities in Another Crab's Treasure. You'll need to reach the Moon Snail's Domain to use them, and you'll need to return to this area to unlock new abilities when they become available.