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Based on our record, HoDoKu seems to be a lot more popular than card.io. While we know about 14 links to HoDoKu, we've tracked only 1 mention of card.io. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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: 10 months ago
On a Windows PC, Hodoku lets you input your own puzzle. You can just Copy and Paste this into the software:. Source: 11 months ago
Don't know about any sites but you can learn specific techniques in hodoku. Source: 12 months 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 1 year 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 1 year ago
First thing I tried was typed card.io in my web-browser to see whether it would bring me to a website associated with this game. Source: over 1 year ago
Yasminoku - Sudoku game and solver totally written in DHTML.
Shared Contacts For GMail - Share contacts and address books with your team in Google Workspace, previously known as G Suite, Gmail, or your mobile Contact app, just like you share Google docs!
nsudoku - A Sudoku game made with ncurses.
ContactBook App - ContactBook helps your business organize and manage contacts centrally and keep them shared with the right people.
Simple Sudoku - Freeware Sudoku Puzzle Maker and Solver
Speare - Speare is a word processor enabling users to brainstorm, organize, outline and develop content.