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Buttons
Fix:fixes start configuration
Undo unsafe:All moves that were not forced are taken back
Load puzzle:loads start configuration from text area (copy start as text into textarea: '.' signals unknown digit = empty field, '1'-'9' are for the given digits;
all other characters and newlines are ignored)
Hint:forced moves or alternative moves, from which ruling-outs follow, get underlined
Solve:does a forced move or forced ruling out
left mouse-button:choose digit
right mouse-button:rule-out digit (or allow again)
middle mouse-button:undo move or ruling out
red digit:force move (only possibility in field, block, row or column)
blue digit:only 2 possibilities in block left (hint for possible pair, X-Wing, ...)
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