is the most advanced V first method. Common top first methods- a) One Flip - This method uses two edges around one center solved and the third edge flipped. There are a total of six cases after this step, for which algorithms are memorized and executed. The third step involves using a common set of algorithms for all top first methods, also called Keyhole last layer, which involves 5 algorithms, four of them being the mirrors of each other. b) Keyhole - This method uses two edges in the right place around one center, and the third edge placed elsewhere on the puzzle. The centers of the fourth color are then solved using the slot formed by the non-permuted edge. The last step is solved using Keyhole last layer algorithms. c) OKA - In this method, one edge is oriented around two edges in the wrong place, but one of the edges that is in the wrong place belongs to the block itself. The last edge is found on the bottom layer, and a very simple algorithm is executed to get it in the right place, followed by keyhole last layer algorithms. Some other common top first methods are WO and Nutella. Many Pyraminx speedsolvers learn several methods, particularly top-first methods, and use the method that is best for the given solve. There is no consensus among pyraminx speedsolvers regarding whether top-first or v-first methods are faster. Variations There are several variations of the puzzle. The simplest, Tetraminx, is equivalent to the (3x) Pyraminx but without the tips (see photo), resembling a truncated tetrahedron. There also exist "higher-order" versions, such as the 4x Master Pyraminx (see photos) and the 5x Professor's Pyraminx. The Master Pyraminx has 4 layers and 16 triangles-per-face (compared to 3 layers and 9 triangles-per-face of the original), and is based on the Skewb Diamond mechanism. This version has about 2.6817 × 1015 combinations. The Master Pyraminx has 4 "tips" (same as the original Pyraminx) 4 "middle axials" (same as the original Pyraminx) 4 "centers" (similar to Rubik's Cube, none in the original Pyraminx) 6 "inner edges" (similar to Rubik's Cube, none in the original Pyraminx) 12 "outer edges" (2-times more than the 6 of the original Pyraminx) In summary, the Master Pyraminx has 30 "manipulable" pieces. However, like the original, 8 of the pieces (the tips and middle axials) are fixed in position (relative to each