wrap-reverse, and every cross-axis keyword flipping with it
flex-wrap: wrap-reverse put the second row on top, which is what was wanted — and dropped both rows to the bottom of the board, which was not. align-content: flex-start does not bring them back up. It makes it worse.
Six tiles, three to a row, in a 640×300 board. Put tiles 4, 5, 6 on the top row and 1, 2, 3 on the row below, left-to-right within each row, with both rows hugging the top of the board. The starter is the plain wrap. One property gets the rows the right way round; then look at where the block went, and at what happened to the words *start* and *end*.
Hint
After reversing the wrap, which edge of the board is cross-start? Every keyword that says `start` is now pointing at a different edge — including the one you would reach for to fix this.
The fixture — markup and base stylesheet
You cannot change either of these. They are what your selectors have to reach, and they are the same ones the judge renders.
<div class="grid"><div class="t t1"></div><div class="t t2"></div><div class="t t3"></div><div class="t t4"></div><div class="t t5"></div><div class="t t6"></div></div>
*, *::before, *::after { box-sizing: border-box; } html, body { margin: 0; padding: 0; } body { background: #0b0b0f; } .grid { width: 640px; height: 300px; display: flex; flex-wrap: wrap; gap: 20px; background: #16161d; } .t { flex: none; width: 200px; height: 80px; background: #7bdff2; } .t4, .t5, .t6 { background: #b5e48c; }