In this variant the numbers in the dotted "cages" have to add up to the designated total (without duplication within the cage), and the numbers in the "thermometers" have to rise, with the lowest in the "bulb" of the thermometer. Otherwise normal Sudoku rules apply.
You can play this grid online here, where there are the standard tools for entering "possibles" and for checking the validity of your entries as you go along. I used the latter feature regularly, and managed to fill in the grid in 64 minutes without blind guessing.
If you like this sort of thing, you probably would enjoy Cracking the Cryptic. They cover two of them a day.
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This reminds me of KenKen puzzles which I've recently discovered through the Scientific American website (though you can access a wider variety of them daily through the KenKen website). I've never particularly enjoyed Sudoku but enjoy the logic and arithmetic cages of KenKen.
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