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Strmckr already gave you good advice on the order in which you can learn more advanced techniques. Some apps offer a practice mode in which you are given a specific grid that definitely needs that technique that you are trying to practice. One of those is my website sudoku.coach. The other one I know of is the windows software hodoku. Source: almost 2 years ago
On a Windows PC, Hodoku lets you input your own puzzle. You can just Copy and Paste this into the software:. Source: almost 2 years ago
Don't know about any sites but you can learn specific techniques in hodoku. Source: almost 2 years ago
If I'm solving in Hodoku it's easy enough to switch to full notation (Options | Show All Candidates | click "no"), but my usual pencil/pen/eraser on paper takes slightly more effort. Source: about 2 years ago
Download/install Hodoku (Free, as in 'beer'; will run on Mac/Windows/Linux - it's a Java .jar file (also available as a Windows executable file). Source: about 2 years ago
I Know It - "I Know It" is an online game for practicing primary-level math concepts.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
GCompris - Educational Game for Children 2 to 10 years old.
Yasminoku - Sudoku game and solver totally written in DHTML.
childsplay - Childsplay is a collection of educational activities for young children and runs on Windows, OSX, and Linux. Childsplay can be used at home, kindergartens and pre-schools.
nsudoku - A Sudoku game made with ncurses.