I made one of these puzzles as an illustration of a global parity deduction in Barns puzzles; it was only natural to consider whether I could produce puzzles using other tetrominoes as well. The proof that I and O tetrominoes do not work in a 5x5 grid is left as an exercise to the reader.
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Rules
Draw a loop which passes through all cells of the grid and which may not pass through any bold borders. The loop must travel straight through icy cells. Two perpendicular line segments may intersect each other only on icy cells.
Barns T
Difficulty: 1/10
Barns L
Difficulty: 4/10
Barns S
Difficulty: 6/10
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