GPT-5.6-Sol (high) missed level 3 on a 3×3

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 · 6 movesafter turn 5 · 11 movesafter turn 6 · 12 movesafter turn 7 · 13 movesafter turn 8 · 14 movesafter turn 9 · 16 movesafter turn 10 · 17 movesafter turn 11 · 18 movesafter turn 12 · 19 movesafter turn 13 · 20 movesafter turn 14 · 23 movesafter turn 15 · 25 movesafter turn 16 · 27 movesafter turn 17 · 29 movesafter turn 18 · 36 moves