Get them in a row.
Connect 3 & Connect 4 — discs fall to the bottom. Pick a column and be the first to line up 3 (or 4) in a row, in any direction.
Tic-Tac-Toe — no gravity. Tap any open square; first to three in a row wins. Red is X, Yellow is O.
Controls — click/tap, or use arrow keys / a gamepad to aim and Enter/A to play. Start = new round.