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Wow, the comments!
Just so you know, this "Tetris" has more power than the computers that the first/second Heroes games were originally written for.
It's a great portable console, and many excellent strategy games have been released for it.
I checked out Clash of Heroes. The style, strangely enough, reminds me of the fifth Heroes game at the beginning. Even the sound design is from there. The gameplay itself – from moving the hero around the map to the tactics in battles – is quite original for the Might and Magic universe. Although, in general, the genre can still be defined as the same – a hero-based TBS/RPG.
The game is worth checking out; the gameplay is very fresh and engaging. I thought they were making some "anime-style nonsense," but it turned out to be something truly original, interesting, and still in keeping with the spirit of the series.
By the way, after the first few hours of playing, I can't say anything good about the plot (nor anything particularly bad – but it's not very impressive so far).
P.S. It's strange that they haven't ported the second or third Heroes games to the DS yet – the platform is perfect for them.