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# Unlock the Key – Part 2

Dec 09, 2017, 6:30 AM

Convert the square frame into the shape of a key a series of sliding moves.

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# Unlock the Key – Part 1

Dec 05, 2017, 5:23 PM

Convert the square frame into the shape of a key in the minimum possible number of sliding moves.

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NEW!

# The Chevron Challenge

Nov 25, 2017, 2:31 PM

Two chevrons stack on each other, point in the same direction – upwards. Convert them into a pair of chevrons…

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# Revealing the Pyramid

Nov 18, 2017, 11:00 AM

Turn the perfect hexagon into the pyramid-like shape.

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# Uncovering Octagon

Nov 11, 2017, 6:00 AM

Convert the hexagonal shape into the hollow octagon.

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# House Downsizing

Nov 04, 2017, 5:45 AM

Change one house shape into another using the most optimal way…

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Size: 15x15

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# Arrow Right

Oct 28, 2017, 6:00 AM

Turn the coin arrow to the right. Reach the goal in nine single-coin sliding moves.

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# The Jumping Coins

Oct 28, 2016, 12:36 PM

Exchange the two groups of coins.

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# Presidents’ X-change

Sep 24, 2016, 5:16 PM

Exchange the two diagonals of the square array employing the minimum single-coin sliding moves.

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NEW!

# Cut off the Corners

Aug 12, 2016, 11:51 AM

Move the minimum number of coins to get rid off ALL the right coin angles.

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NEW!

# A Coin Necklace

Jul 15, 2016, 11:52 PM

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

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# Olympic Coins 2

Jul 08, 2016, 11:17 AM

Flip the “Olympic Coins” shape as shown in the Goal, performing just six special single-coin moves.

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# The Frame Switch

Jun 30, 2016, 11:47 PM

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 Delta Unfold

Jun 23, 2016, 11:56 PM

“Unfold” the coin delta in a series of single-coin moves…

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# Always Three

Jun 16, 2016, 11:51 PM

By moving one coin at a time, reach the Goal position so that after each move…

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# The Coined Rows

Jun 09, 2016, 11:59 PM

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

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NEW!

# Olympic Coins

Jun 02, 2016, 11:43 PM

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

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NEW!

# The GO Challenge

May 26, 2016, 11:57 PM

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…

NEW!

# Coins & Triangles

May 12, 2016, 8:18 PM

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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