You can't really do notes, etc. on the electronic games, unless you take the time to transfer them to paper! I did the note thing for a couple of months until I began to realize there were patterns and immutable laws involved. Good bye notes, hello speed!

My new handheld has the type with two possible correct solutions to several of the lines. On the "Beginner" level it only accepts ONE of the variations which, to my way of thinking would be confusing to a beginner. On the higher level it will accept either solution. Probably has to do with programming difficulties.

A few days ago I picked up another handheld game which is back lighted and that helps in low light or dark situations. The only drawback is that it uses a stylus! I have really haven't done much with it yet but I will let you know how it works, soon. So far, the first one was the best! It is the one that is oriented horizontally, about $12 US.