@cameronesfahani @theoremoftheday start at 0. Dotted line leads back to 0. First digit 1, move 1 green arrow round to 1. Dotted line leads to 2. Next digit 2, move 2 green arrows round to 0. Dotted line leads to 0. Final digit 0, don't move.
You finished on 0, so 120 is divisible by 4