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I was recently informed that there are some old education games available online for free. There is quite a large collection of them, and they should be able to take up some of your time this Saturday. I expect that many of them will be well below your level, but they might be droll regardless.
Oooh, it looks like they have Treasure Mathstorm!
I used to love that one!
Yep, definitely checking out this website…
I guess the Webmaster also gives an endorsement of this.