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A Coin Necklace

Jul 15, 2016, 11:52 PM | by Serhiy Grabarchuk Jr

Convert the necklace into two triangles (“diamonds”), different in size. Three sliding moves are required.

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The Frame Switch

Jun 30, 2016, 11:47 PM | by Serhiy Grabarchuk Jr

Reach the square frame in the Goal position. A move consists of sliding a coin to a new position where it has to touch at least two other coins. Happy 4th of July!

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The Coined Rows

Jun 09, 2016, 11:59 PM | by Serhiy Grabarchuk

Eight coins are arranged into 4 rows of three coins each. Move just two coins to get…

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Olympic Coins

Jun 02, 2016, 11:43 PM | by Serhiy Grabarchuk Jr

Change a stylized “Olympic” pattern into the one shown in the Goal. Single-coin sliding moves to do that.

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The GO Challenge

May 26, 2016, 11:57 PM | by Serhiy Grabarchuk

Convert the “G” letter into the “O” letter. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

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In Puzzleland

May 19, 2016, 3:45 PM | by Sam Loyd

Nine coins placed in a 3×3 array, produce 8 rows of three coins each – three horizontal rows, three vertical rows and two main diagonals. Move the minimum possible number to…

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Coins & Triangles

May 12, 2016, 8:18 PM | by Kobon Fujimura

Fifteen equilateral triangles can be spotted in this arrangement. What is the minimum number of coins to be removed in order to get rid of all the equilateral triangles in it?

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Wi-Fi Switch

May 05, 2016, 2:15 PM | by Serhiy Grabarchuk Jr

Convert the “W” letter into the “F” letter. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

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Nob’s H-2-O

Apr 28, 2016, 11:54 PM | by Nob Yoshigahara

Convert the “H” letter into the “O” letter – a 3×3 coin square without the central coin. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

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The Six Pennies

Apr 21, 2016, 11:16 PM | by Henry E. Dudeney

Turn the two rows of coins into the coin circle in just three moves. A move consists of sliding a coin to a new position where it has to touch at least two other coins.

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Coin Cup

Apr 14, 2016, 3:49 PM | by Serhiy Grabarchuk Jr

Move just two coins to turn a coin cup upside-down. The restriction is that after each move a moved coin should touch two other ones.