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Zudoku Puzzo

Price: Free

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App Description

This app provides innovative tools that simplify the solving process.
It comes with a tutorial that guides you through the process in a few simple steps.
Some definitions:
A Cell is one of the 81 small squares.
A Box is one of the 9 3x3 grids.
A Unit refers to a box, a row, or a column.
The Peer of a cell is the collection of the 20 other cells in the cell's three units.
To solve a cell, you just need to know the A-B Rules.
A-Rule: If a blank's peer contains eight different digits, the missing digit is the solution.
Help: The Input Bar automatically removes all the candidates that are in its peer so you do not need to worry about entering an invalid digit.
B-Rule: If one of the valid candidates in a unit is found in the peers of all but one blank cells, that digit is the solution to that blank.
Help: Each button on the Unit Bars around the grid corresponds to a Unit.
Tapping a button shows the blank cells in cyan on the unit displays the valid candidates on the Brown Bar.
If more help is needed, just tap a digit on the Brown Bar.
The peers of all the occurrences of that digit are shown in pink.
If only one cyan cell is left, the digit is the solution to the cell.
Other Tools:
Hint: Shows a solvable cell. This is helpful when you cannot find one and unable to proceed.
Branch: Automatically selects the first possible option of the focus cell and save the configuration. Use this when no more cells are solvable.
Backtrack: Automatically selects the next candidate of the current branch and reloads the previously saved configuration. Use this when the current candidate of the branch is incorrect.
Check: Shows the incorrect entries if present.
Reveal: Fills the focus with its solution. Use this as the last resort.
Peer: Highlights all the cells that are in the peer of the focus cell.
Erase: Clears all the entries that are not locked, revealed or branched.
Lock: Makes the cell not erasable. Use this when you think the entries are correct.
Unlock: Makes the cell erasable again. Use this when you realize the entries are actually incorrect.
Undo: Reverts the last action that changed the content or the state of a cell.
These tools are like training wheels for bicycles; your skill will sharpen and you'd need them less and less. But they are always there in case you'd like to play a quick game.
There are additional 15 character sets to try if you'd like to use something other than regular numbers.
81 puzzles.

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App Reviews and Ratings

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