I love designing perfect clear puzzles for my dear friend who loves Tetris. Here's a lovely puzzle I crafted today.
Original Puzzle (Warm-Up)
Starting with this field,
place this exact sequence of pieces: O, S, L, I, Z, T, and J,
where rotation is allowed but holding is not, so that the field is empty at the end.
The Challenge
After creating this puzzle, I remembered that my friend loves to "ZZZ...", so I would love to show them how much I care by adding extra copies of the (red) Z piece to the sequence, immediately after the first oneZ piece. Can you help me by finding the least number of Z pieces I need to add so that the puzzle can still be solved?