Lists

Puzzles picked by theme, easiest first.

• Classic warm-ups Plain sudoku, no extra rules, from gentle to firm. 15 puzzles
• Killer basics Cages and sums, nothing else. A good place to start. 15 puzzles
• First steps in thermos Digits climb from bulb to tip. Gentle thermometer puzzles. 15 puzzles
• Arrow starters The circle is the sum of its arrow. Easy ones first. 15 puzzles
• Kropki dots Black dots double, white dots differ by one. 15 puzzles
• German whispers Neighbours on a green line differ by at least five. 15 puzzles
• Diagonal sudoku Both long diagonals hold 1 to 9 as well. 15 puzzles
• Sandwich sums The clue outside is the sum between the 1 and the 9. 15 puzzles
• Renban runs Each magenta line holds a run of consecutive digits, in any order. 14 puzzles
• Palindrome lines Each grey line reads the same from either end. 14 puzzles
• Between lines Digits on the line sit strictly between its two circles. 12 puzzles