Great concept. I see a number of comments asking for more sides but I don't think it would be possible unless it formed a perfect geometric shape. (I think I am wording this right.). I think a better way is to have larger puzzles with some of the revealed sides be revealed in ranges rather than absolute numbers. For example, if the number is 4 than instead of just revealing that it is in fact 4 show that the number is "less than 5" or "between 3 and 6". Again I think this concept could maybe work but only for larger puzzles.
legend is possible (with a little luck here and there). In the levels of the early areas you need to focus on controlling the battle. The abilities Break, Disrupt, Crystalize, and 1 level of Reform will get you through most of it. Before each battle save your game so that you can try out different strategies. Occasionally, re-specing will help a lot but don't overdo it (it costs money)
@Tiger165, I don't think so. I believe his first Tesla game came before that particular ERB
Here the youtube link for those who don't know what ERB is.
http://www.youtube.com/watch?v=gJ1Mz7kGVf0
@13oojum, It is more of a matter of how to deal with specific threats. For example Ligthning Crypts, Shatter Crypts, Rocket Dens, and Balistas are good against Amazons because they can hit from outside of the charm range.
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Yup thanks :D