There seem to be a few free online. Don't know which is a good one as you'll need one with different (or at least easy) difficulty levels. I remember I had a lot of fun like 10 years ago with a dos game I think it was. Can't remember the name though. Don't know if anyone recognises it but it was blue against red and when you pieces died there was an animation of the other piece hitting or slashing at the piece. It was a lot of fun but I can't really find any info on the name.
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