Logic Masters Deutschland e.V.

Please enjoy this sudoku based on the design classic that is the London Tube map (with apologies to Harry Beck :p)

Rules:

Normal sudoku rules apply. In addition, the nine Tube lines have the following rules:

(N.B: the purple and grey lines run parallel from r4c3 to r2c1. The pale green and black lines run parallel from r7c7 to r6c7. In ALL CASES, digits may repeat freely on a line if permitted by other rules.)

• District Line (Dark Green) - German Whispers [adjacent digits must differ by 5 or more]
• Central Line (Red) - Entropic Line [any set of three sequential cells must contain a low digit (1-3), middle digit (4-6) and high digit (7-9)]
• Jubilee Line (Grey) - Thermo [digits must increase from the bulb end, which is to be determined by the solver]
• Metropolitan Line (Purple) - Modular Line [any set of three sequential cells must contain one digit from 147, one from 258, and one from 369]
• Waterloo and City Line (Pale Green) - Between Line [digits along the line must be strictly between the digits on each end]
• Northern Line (Black) - Renban [each line must contain a set of consecutive, non-repeating digits] [N.B: there are two branches of the Northern line, which both start at r9c5, and CROSS OVER at r2c5 (Camden Town!)]
• Piccadilly Line (Dark Blue) - Ten Line [the line consists of one or more contiguous groups of cells, each of which sums to 10. These groups of cells cannot overlap.]
• Victoria Line (Light Blue) - Anti-Whisper [adjacent digits must differ by FIVE OR LESS]
• Bakerloo (Brown) - No ruleset, just there for aesthetics, and so my fellow Tube dorks don’t shout at me :)

Links to online solving tools:

• F-Puzzles
• Cracking The Cryptic