Brikks can be viewed as tabletop Tetris, with each player trying to place falling blocks into their grid to score the most points.

To start the game, each player draws a different quadromino at the bottom of their individual game sheet. On a turn, the active player rolls two dice — a colored d6 and a numbered d4 — then optionally rolls both dice again. The two dice determine which specific quadromino — that is, which colored shape and in which orientation — all players must “drop” into their grid. To represent this, you draw an outline of the block at the bottom of your sheet as if you had dropped it in from the top, then X out the spaces covered by the quadromino.

If you cover a circle on the grid that’s the same color as the quadromino just placed there, you collect two energy points. By spending one energy point on a turn, you can possibly “rotate” the quadromino to be placed depending on what dice were rolled; by spending five energy points, you can place exactly the quadromino you want, ignoring the result of the dice. As you collect energy, you might cover an X on the energy chart; if you do, you track these Xs on a separate “extra point” bar, with the points escalating for each X you collect. If you complete 2–4 lines through the placement of a single quadromino, you collect an additional 1–4 Xs for this extra point bar.

Each player has three bombs they can spend to blow up a block instead of placing it, but by doing so you give up endgame points.

As soon as you can no longer place a quadromino in your grid, your game is over. Once everyone has filled their grid to the top, tally your points. In addition to the extra points bar and any bombs unused, you score 1–5 points for each horizontal line that contains 8–10 Xs, with these line points doubling, or even quadrupling, as you go higher in the grid. Whoever scores the most points wins!

Brikks also contains rules for a duel mode and a solitaire mode.