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Ultimate (or Inception) Tic Tac Toe

What if each square on a Tic-Tac-Toe board had another Tic-Tac-Toe board inside of it?

Word Ladder: Two to Six (6-steps)

COLD to COOL. BAND to SING. Change one letter at a time — can you find the path?

Bulls and Cows

How quickly can you break the numeric code?

Fractals: Koch Snowflake

You could keep zooming in on this snowflake forever!

Fraction Puzzlers: Add and Subtract Fractions To Reach A Number

You only have six digits to form three fractions. Can you combine them to get to 0?