Here is where the "Lumines" DNA shines. When you clear a line, it does not disappear instantly. Instead, a scanning line moves from left to right. If your cleared line coincides with the scanner, it triggers a "Lumpty Cascade": all adjacent blocks vibrate and dissolve, and any Lumpties in the zone are launched upwards, potentially clearing multiple lines above them.
Because the original Flash plugin died in 2020, finding a working version requires a bit of digital archaeology: Lumpty Tetris