GPT-5.6-Luna (high) missed level 4 on a 2×2

What the model saw

Each picture is the exact image the model was sent; highlighted: start.

startafter turn 1 · 1 movesafter turn 2 · 2 movesafter turn 3 · 3 movesafter turn 4 · 4 movesafter turn 5 · 5 movesafter turn 6 · 6 movesafter turn 7 · 10 movesafter turn 8 · 14 movesafter turn 9 · 18 movesafter turn 10 · 22 movesafter turn 11 · 27 movesafter turn 12 · 31 movesafter turn 13 · 35 movesafter turn 14 · 39 movesafter turn 15 · 44 movesafter turn 16 · 48 moves