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

Website

knotil.us