A feeding-frenzy of tetrominoes. Touch a rival — any cell overlap and one of you is eaten: the winner grows in at the contact face (keeps colors).
Clear a straight run of 10+ blocks for a big score. Empty rows or columns in your body snap shut.
Bigger always eats smaller on contact; equals — faster or pushing wins (a moving you beats an equal bot).
Grow to 64 blocks and clear every last rival to take the pond.
Rounds are timed — if you get eaten you spectate until the next countdown.