How to approach it
The shift opens with a step left and then a step right. The first long bar arrives as crate number 6. Over the first 21 crates the longest wait between two bars is 6 crates. The two step crates come back to back at numbers 1 and 2, which suits a flat surface. A square comes within the first three crates, an easy piece for the first corner. It is a Marathon shift: no finish line, faster every ten rows. On Hard the crates start at level 8 and fall quickly from the first one.
- The bar is late here: build flat on the other nine columns and do not fill the open one while you wait.
- At this speed, look at the next three crates rather than the one falling; the decision should be made before it appears.