Knotilus

Ten numbers must be split into three increasing four-number sequences in which each number is the sum of the two before it. One shared number, the knot, appears in all three, while the rest are used once. Several valid sequences exist each day but only one set works. Easy and hard modes, an archive and a leaderboard are offered.

Category

Math, Logic

How you play

Find the equation, Deduction

Languages

Any (no reading needed)

Daily puzzle

Yes

Unlimited mode

No

Archive

Yes

• 7.0
  Sumplete

  Delete numbers until rows hit their sums
  Play
• 6.6
  Cagey

  Fill number cages to hit arithmetic targets
  Play
• 6.6
  Dodeku

  Place number tiles to match the target sums
  Play
• 6.5
  Ophex

  Combine seven numbers into one target number
  Play
• 6.3
  Number Island

  Group adjacent numbers to hit target sums
  Play
• 6.2
  Dozenal

  Merge numbered tiles built around twelve
  Play
• 6.1
  CancelWise

  Cancel cells until rows and columns hit targets
  Play
• 6.1
  SUMS

  Place numbers in order using adjacent totals
  Play