The Pyraminx, also known as the triangle Rubik's Cube is a tetrahedron-shaped 3-layered twisty puzzle, having four triangular faces which are all divided into nine identical smaller triangles. This is the second best selling puzzle toy in the World after the Rubik's Cube with over 100 million pieces sold. It was invented by Uwe Mèffert (Germany) in 1971.
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Solving a Pyraminx is much easier than a Rubik's Cube. It has 3,732,480 possible permutations which is relatively a small number (similar to the 2x2x2 Pocket Cube), so a personal computer can easily go through all of the possible scrambles. It can be solved from any random position in less than 12 moves. I'm presenting below the easiest solution where you only have to learn a couple algorithms.
Let's mark the four corners of the puzzle with letters, just like in the notation of the Rubik's Cube, a letter by itself means a clockwise 120o turn of the corner and an apostrophe marks a counterclockwise turn (eg. R'). We are going to use these letters to describe algorithms in this tutorial. For example: L' F L F'
We can easily notice that there are three tipes of pieces: Corner tips (A), centers having three stickers (B) and edges with two stickers (C).
2. Solving the tips and centers
The solution of the Pyraminx begins with turning the 4 corners (A) to match the center pieces. Tthis is just a simple turn for each corner because the three sides of the center pieces (B) are linked together. When the tips are OK, deep turn the puzzle to make the three center colors match on all faces. Try to reach the state on the image above! When you're done all that's left is solving the remaining 6 edge pieces (C).
3. Two edges next to one corner
In this stage we want to solve three edges around the top corner. Use the Right and Left algorithms below depending on the direction of the insertion. These leave the pieces marked with the asterisk (*) in place. Usually you'll need an algorithm for the last piece because the first two can be solved intuitively.
Right algorithm: R F R' F'
Left algorithm: L' F' L F
4. Last layer edges
All that's left is to permute/cycle the last layer edges. Take the puzzle in your hands with the scrambled face on the left and perform the requred turns, depending on your case.
Clockwise cycle: U' F U F'
Counterclockwise cycle: U L' U' L
Flip tow edges: F U' F' U F' L F L'
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