PLL vs COLL vs ZBLL, explained

Take a solved cube and put one color on top. Twist the top layer once. Every top sticker is still the right color facing up, but the side colors have moved. That is a permutation: the pieces are oriented, and they are in the wrong seats. PLL handles pictures like that.

Twist one corner so the top color is on the side, and put the four edges back so they still show the top color. You have a cross, and at least one corner is twisted. COLL and ZBLL both start from a cross. They disagree about how much of the repair happens in one sequence.

If an edge has the top color on the side, you are in none of these three sets yet. The edges have to be oriented first. Beginner methods do that as their own step. ZBLS, which TopCuber teaches later and marks optional, is one advanced way to orient edges while solving the last slot. PLL, COLL, and ZBLL assume that work is already done.

PLL means Permutation of the Last Layer. Every sticker of the top color is already facing up, on edges and on corners. The algorithm swaps pieces into their home seats. It does not twist a corner or flip an edge. If something still needs twisting, it is not a PLL case.

There are 21 PLL cases. TopCuber groups them as 4 edge-only cases, 3 corner-only cases, 10 adjacent corner swaps, and 4 diagonal corner swaps. The edge-only group is the small set people use after COLL, when the corners are finished and only the edges remain. The other groups show up whenever the whole last layer is oriented and still needs to be permuted, which is the last step of the common CFOP speed method as well.

PLL is the smallest of the three sets and the most widely useful. A child who learns it can use it whether or not they ever learn COLL or ZBLL. That is why it comes first in TopCuber. Twenty-one cases is a real project for a beginner, and it is still a project with an end you can see.

COLL means Corners of the Last Layer. The edges already show the top color, so the cross is done. Corners may be twisted, in the wrong seats, or both. A COLL algorithm orients and permutes the corners and leaves the edges to be placed afterward.

TopCuber has 40 COLL cases. They fall into the same seven family names you will see again in ZBLL: Sune, Antisune, L, T, U, Pi, and H. Six of those families have 6 cases each. H has 4. After COLL, the corners are solved. The edges may still need one of the edge-only PLL cases, or they may already be solved. So COLL plus a short PLL is a two-step finish for an edges-oriented last layer.

COLL is the middle step in the app on purpose. The family names train the eye. A child who can tell a T corner pattern from a Pi corner pattern has started the recognition that ZBLL will ask for later. They also have a complete way to finish many last layers without learning hundreds of extra sequences.

ZBLL means Zborowski-Bruchem Last Layer. It starts from the same cross as COLL. One algorithm solves the corners and the edges together. There is no second sequence for the edges.

People often say ZBLL is 493 cases. That count includes the 21 PLL cases, which are the edges-oriented last layers whose corners are already oriented too. TopCuber keeps those 21 in the PLL track and teaches 472 further ZBLL cases. The families match COLL: T, U, L, Pi, Sune, and Antisune have 72 cases each in the app, and H has 40. A single COLL pattern is the parent of many ZBLL cases, because the edges can be permuted in more than one way while the corners show that pattern.

ZBLL does not replace PLL. You still want PLL for last layers that are fully oriented, and for the edge-only finishes after COLL. ZBLL adds the cases where the cross is done and the corners are not a pure PLL picture. The longer explanation of who should start that set is on the ZBLL guide.

Learn PLL first if they can already solve the cube and want a named set with a finish line. Learn COLL next if they enjoy the cases and you want a two-step way to finish an edges-oriented last layer. Start ZBLL when PLL is familiar, the COLL shapes are starting to look different from each other, and the child is asking for more. Skip ahead only if practice is still fun. A parent in TopCuber can open a later track by hand. The default path waits until earlier units are known.

A child who is still building a beginner cross does not need any of these names yet. The first-solve guide is the calmer place to begin. Algorithms are easier on a cube that turns without a fight. The cube-choice guide stays away from brand rankings and talks about feel, size, and safety instead.

None of the three sets measures whether a child is "a real cuber." A solved cube is a solved cube. PLL, COLL, and ZBLL are optional tools for children who want the last layer to take fewer looks. TopCuber's daily plan, reviews, and boss challenges exist so those tools arrive a few cases at a time.