What the Different Training Categories in Blindtrainer Mean

Blindtrainer organizes its drills by the type of piece and the solving situation you want to rehearse, not by difficulty level. If you are learning 3-style commutators for Rubik's Cube blindfolded solving, the category you pick determines which cases the trainer serves you: corners, edges, wings, centers, flips, twists, parity, or letter-pair words. The right choice depends on which solving method you use (3-style, M2/OP, LTCT, or similar) and which piece set your method assigns to each algorithm.

How the categories are grouped

The site lists its drills in a single menu, but they fall into a few practical families:

The case counts tell you how large the drill pool is. A larger number means more distinct cases to cycle through; a smaller number like Floating Flips (66) means a tighter, more repetitive set.

What each category is for

Corners

Corner commutators. This is the standard 3-style corner set: 378 cases covering every corner cycle you can encounter. Use it once you know basic corner commutators and want speed and recall under pressure.

Floating Edges, Wings, and U Floating Midges

These separate edges by piece type because different cube sizes and methods treat edges differently.

• Floating Edges (440) — general edge commutators, the counterpart to Corners for a 3x3.
• Wings (506) — the edge pieces on 4x4 and larger cubes that behave like a single "wing" per edge. If you solve big cubes blindfolded, this is your edge drill.
• U Floating Midges (440) — midge edges drilled with a U-layer floating buffer approach. Choose this if your method floats the buffer into the U layer rather than keeping a fixed buffer.

Floating Flips and Floating Twists

These are orientation-only cases, not cycles.

• Floating Flips (66) — edges that are in the correct position but flipped.
• Floating Twists (98) — corners that are in the correct position but twisted.

They are small sets because orientation cases are far fewer than permutation cases. Drill these when your cycles are solid but you keep losing time or making errors on flipped/twisted pieces.

Floating Parity and Corner: 78 / Wing: 23

Parity happens when your corner and edge cycles don't match up, leaving a swap you must resolve. Floating Parity trains the general parity situation; Corner: 78 and Wing: 23 are narrower parity drills tied to corner and wing pieces respectively. Use these once you can already complete full solves and want to stop parity from breaking your execution.

XCenters and +Centers

Center commutators for big cubes, split by center type: XCenters (440) for the X-center positions and +Centers (440) for the +-center positions. Pick the one matching the center type your method solves first, or drill both if you solve 5x5 and up.

Parity/Twist Words

Parity/Twist Words (552) drills the letter-pair words you use to memorize parity and twist cases. This is a memory drill, not a turning drill — it trains recall of your word list rather than finger speed.

LTCT

LTCT (252 cases) is a drill set for the LTCT method specifically. If you don't use LTCT, skip it; the case pool won't match your solving approach.

How to choose

1. Match your method first. If you solve 3x3 with 3-style, start with Corners and Floating Edges. If you solve big cubes, add Wings, XCenters, and +Centers. If you use LTCT, use the LTCT set.
2. Match your buffer style. "Floating" categories assume you float the buffer rather than keeping it fixed. If you use a fixed buffer, the floating variants may not match how you actually solve.
3. Add orientation and parity last. Flips, twists, and parity are smaller sets and easier to absorb once your main cycles are reliable.
4. Use the case count as a workload signal. A 66-case set is a short, repeatable session; a 506-case set is a long-term project. Start with the smaller sets in a family if you want quick wins.

Practical notes

The trainer tracks a Streak, Total cases trained, Time spent training, and Most cases trained in 1 day, so you can measure progress per category. It also offers Sync Data, Import, and Export plus an ID field, which lets you carry stats between sessions or devices. Accent color and a Speffz lettering scheme are configurable, so the letters shown match your own memo system. There is also a Slow Cases view and a Hard Reset option for clearing data.

The site states it is kept 100% free and supported by donations, so no category is gated behind payment.