DIBS
Call dibs on the blocks. Build chains. Don't get crushed.
Blocks ride a belt down the middle of the screen in sets of two or three. Grab one, carry it to your side and place it: four touching blocks of one color pop, diagonals included, and chain clears make room. Meanwhile the belt keeps closing in on your pile. When it reaches your wall, you're crushed.
Play Solo (Marathon) to chase your best score through 99 levels, with ejector blocks past level 20, or take on the AI at Easy, Normal or Hard, first to three rounds.
Keyboard: W/S or the arrow keys to move, Space or J to grab and place, B to put a block back (or lift one off your pile), Q/E to jump to the top or bottom, hold L to tumble your outer column, Enter to pause. Controllers work too. Your settings and best scores are saved to your account.