I was diagnosed with MCI 2 years ago at 52. I have an app on my iPad called MindPal. I find it challenging and fun. It has a variety of games each day that you can play for free, and additional features are available for a monthly fee (I have the free version). This is a partial quote from the game’s description of the science behind their app: “ Think of MindPal as a brain gym in your pocket. MindPal provides you with a personal daily program that adjusts over time to maximize results. Enjoy a variety of games that challenge critical cognitive skills such as memory, attention, language, math, and more. The difficulty of the games adapts to your level, to ensure you are constantly challenged. Track your performance as you play, and get in-depth insights about your brain.”
On the iPad or iPhone MindPal also has Wordle and some additional games from New York Times for free (and the option to pay for more). However my sister has MindPal on an Android device and it does not include Wordle or the other New York Times games.
What I like about MindPal is it measures and tracks your speed, memory, attention, flexibility, language, math and problem solving so you can see what areas you need to work on and how you have progressed over time. I have been playing for about 1 1/2 years and I feel it has helped my brain.