Drop pulsing two-tone blobs and clear groups of four, but only while their color is the one showing on the beat.
A falling-blob match-and-clear puzzle with a rhythm twist. Every blob holds two colors and the whole board pulses between them on a global beat. A connected group of four or more blobs only clears when their shown colors all line up on the beat, so timing the board's flip matters as much as where you stack.
Falling blobs that clear when four or more of a colour connect is Puyo Puyo, created by Compile and owned by Sega since 1998.
The original twist is rhythmic: every blob holds two colours and the whole board pulses between them on a global beat, so a group clears only when its shown colours line up on the beat.
Puyo Puyo is won by building long chains and setting them off at will. Tying clears to a beat takes away the "at will" — the chain you built is only a chain for part of each cycle, so the game becomes about timing a structure rather than just constructing one.
Pulse Blobline reinvents the falling-blob match puzzle by syncing every clear to a global rhythm, layering timing onto color-matching. It's an original free browser game on PlayPendium with daily and practice modes.