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Normal Sudoku Deconstruction rules apply: Fill the grid with 4 non-overlapping 2x2 square regions, such that each region contains the digits 1-4 once each and no digit repeats in any row or column. Cells outside regions do not contain digits.

Crossing Loop: Draw a single loop travelling orthogonally through the centers of some cells. The loop may visit some cells twice, but must travel straight through such cells each time. The loop can not otherwise self-overlap or self-intersect.

Japanese Sums/Roller Coaster: Clues to the left of rows indicate the sum of values on horizontal segments of the loop in that row, in the correct order. Clues above columns indicate the sum of values on vertical segments of the loop in that column, in the correct order. If there are clues outside a row/column, all the clues for that row/column are given, with the caveat that that a '...' stands for zero or more omitted clues.
Note that a segment that is entirely outside any region is listed as a clue with a value of 0.

Double-Crossers: Digits on cells where the loop crosses itself are doubled in value.
CTRL + z CTRL + y Erase elements that belongs to the selected mode Erase problem or solution grid

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Mode: Surface