Kobo Touch e-reader
A device with one button to operate it (beside the sleep slider)! Amazing!
I have been successfully downloading books for free and applying them to the e-reader on my Linux PCs using Calibre and the USB connecting cable.
The kobo Touch originally came with a Chess game. Now it comes with a version of Sokoban called "Unblock It". When you reach level 200 in Unblock It, the level displayed goes back to 1.
If you switch between difficulty levels, it does remember which one you were on when you go back.
Easy level 19 has 14 moves minimum.
Impossible level 1 has 25 moves minimum.