A NEW DIMENSION
Meet Tri 3D
You know three in a row. Now imagine the board has an upstairs.
Take three little 3 × 3 boards and stack them one above another. That gives you a cube of 27 spaces — and a few more places to hide a clever move.
Three layers. One game.
You and your opponent take turns placing an X or an O in any empty square, on any layer. Nothing falls to the bottom: you can play straight onto the top or middle board whenever you like.
The aim is beautifully simple: make three of your marks in one straight line. That line can stay on a board, travel through the boards, or cut diagonally across the whole cube.
See the three ways to win
On one layer
The familiar one: three across, down or diagonally on any single board.
A little help finding your bearings
The cube view shows the top, middle and bottom boards stacked apart so you can reach every square. They are still aligned: each square sits directly above the matching square on the next layer.
Drag the glass cube sideways to turn it or up and down to tilt it. The Turn and Tilt sliders give you finer control. Choose Top, Middle or Bottom to focus on a layer, or open Precise placement to select a square by its row and column. You can also choose Flat layers to see the three boards separately. Switch views as often as you like — your moves stay exactly where they are.
When someone wins, the winning squares light up. In cube view, a line joins them so you can see how the victory fits together.
Your first few moves
Start by watching for the familiar pairs: two marks on one board still need blocking. Then look up and down. Two matching marks in the same position on different layers can be just as dangerous.
The centre of the middle board belongs to lots of possible lines. It is a useful place to look — but keep checking the rest of the cube. A threat upstairs is easy to miss when you are busy downstairs.
There are 49 straight winning lines altogether: 24 within the three horizontal boards, nine straight columns, twelve diagonals through vertical planes, and four corner-to-corner diagonals through the cube.
Play your way
Choose the computer for a solo game, with Casual or Thoughtful difficulty. Or choose A friend and pass the device between turns. X always starts; against the computer, you swap marks each round.
There is no gravity, no dissolving marks and no rush. Just take a moment, look at all three layers, and find your next little possibility.