Keeping the tiles facedown, draw 7 from the deck and place them facedown in a horizontal row in front of you. Draw 7 more tiles and, still keeping all tiles facedown, place one tile on top of each of the other 7 tiles. Draw 7 more tiles, and do the same. You should now have 7 stacks of tiles, each 3 tiles high. Then, take the remaining 7 undrawn tiles and place them faceup, one on top of each of the 7 stacks.
If any two faceup tiles have pips that together total 12, discard that pair of tiles. Then turn the tiles underneath the tiles that were just discarded to a faceup position. Continue this process of discarding pairs of tiles whose sum totals exactly 12.
If you play the bottom tile of the stack, leaving fewer than 7 stacks of tiles, you may not move a tile to this 'empty" spot to create a new stack.
At no time during the game should you have more than 7 tiles faceup.
Variation: In the regular game, the 0-0 and the 6-6, and the 1-0 and the 6-5, must be matched to make 12, because there is no other way to match them. For the other tiles there are at least two ways each tile can be matched. Therefore, the 1-6 can be matched with the 4-1, 2-3, or 0-5. The game becomes much more difficult if you limit more of the tiles to only one possible match each. Try this variation: Require that each of the ends of the matching pair must total six.
The four remaining tiles (0-6, 1-5, 2-4, and 3-3) are tiles with 6 pips each and cannot be matched to another tile in the set so that the ends of the matching pair of tiles would total six. Therefore, the requirement that the ends of the matching pair of tiles total six will not apply to these four tiles; each of these four tiles may be matched with any one of the other three tiles to make a total of 12 pips for the pair, as in the original game.
Reprinted with permission of Sterling Publishing Co., Inc., NY, NY from GREAT BOOK OF DOMINO GAMES by Jennifer Kelley, ©1999 by Jennifer Kelley. (The Sterling book is available as PUREMCO'S GREAT BOOK OF DOMINO GAMES)