The theme for the CtC discord monthly puzzle prompt in March 2022 was Maps and Plans. This puzzle is based on an old map of the London Underground.
London Underground Railways 1908
Normal sudoku Rules
each row, column & 3x3 box contains the digits 1-9
Green lines - German Whispers
each adjacent digit along the line must differ by at least 5
Red & yellow lines - region sums
the sum of the digits along the line is the same for each box that it passes through
blue line - renban
digits along the line are a set of consecutive digits with no repeats but not necessarily in order
grey line - double renban
digits along the line are two sets of consecutive digits with no repeats within each set, digits not necessarily in order
dotted line - palindrome
digits read from either end form the same sequence
grey circle - odd digit
each row, column & 3x3 box contains the digits 1-9
Green lines - German Whispers
each adjacent digit along the line must differ by at least 5
Red & yellow lines - region sums
the sum of the digits along the line is the same for each box that it passes through
blue line - renban
digits along the line are a set of consecutive digits with no repeats but not necessarily in order
grey line - double renban
digits along the line are two sets of consecutive digits with no repeats within each set, digits not necessarily in order
dotted line - palindrome
digits read from either end form the same sequence
grey circle - odd digit
