What's a good iOS game for keeping my mind sharp with color and pattern recognition, something like a digital puzzle?

I recently downloaded "Drop Away: Color Puzzle", and I must say, it's quite the stimulating little game! It's wonderfully organized, like having a card catalog in your pocket, but instead of books, it's colors! The categorization system is brilliant; you drop colored shapes to match and clear the board. I've figured out three new features this week alone – who knew my phone could do this? It’s perfect for those moments when I want to engage my mind without getting bogged down in overly complex strategies. It's quite impressive actually how such a simple concept can be so engaging. I do believe this is quite a find for anyone looking to keep their mind sharp. And it's delightfully intuitive, which is a blessing, really.