请问HN：有没有一种战术和战略深度更大的俄罗斯方块变体？
除了标准的俄罗斯方块四方块颜色外，方块在消除行时可以变成灰色。如果发生消除行的情况，但其上方的行没有同时消除，那么直接位于上方的方块会变成灰色。灰色方块不能参与消除行，因此会成为消除行的障碍。当一行被消除时，位于其下方的任何灰色方块会被移除。你觉得这个变体怎么样？
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In addition to the standard Tetris tetromino colors, squares can change to gray as a result of line clears.<p>If a line clear occurs without the line immediately above it also clearing, any squares directly above turn gray.<p>Gray squares cannot be part of a line clear and hence act as obstacles to line clears.<p>When a line is cleared, any gray squares immediately below it are removed.<p>What do you think of this variant?