The free games on Arcademics are probably rather easy for most of my students. But if you want to spend more time in your comfort zone, this is one place to do it. You don’t have to sign up to play the free games, and you can play against the computer.
A few of the games I tried were: a typing game called Sky Chase:
A geography game called Country Hop:
And one that was pretty easy for me but I think would be very challenging for many students. Anyone who is planning to visit the US would find this very useful. You have to make the correct change. It’s in the Money section, called Dolphin Feed: