The first player places a letter on the table, and then every successive move involves building letters off of that first letter, such that no other letter touches the table. The letters have little notches and also little isolated teeth, like the teeth of a gear, that fit nicely into the notches, while allowing a little bit of movement. By matching up a tooth of one letter with a notch of another letter, you can add the new letter to the tree, subject to the physical stability of the placement.
On your move, you have a choice between two (effectively) randomly chosen letters. You take one and try to add it to the tree in a way that allows you to connect together a set of letters that can be anagrammed to form a word. The letters must be a contiguous set. Your score is the number of letters in the word that you were able to make.
Even once you find a set of letters in the existing tree that you can connect your chosen letter to, to form a new word, it can often be a huge challenge to place that new letter. It must connect one of its notches or teeth to a complementary tooth or notch of one of the letters in your word, and it must result in a balanced structure that continues to stand on its own. Consequently, whenever someone is placing a new letter, there is a tension to the process that is similar to those moments when someone is removing a piece from a Jenga tower (though it is generally not at the Jenga level of pressure). However, Konexi is actually better than Jenga because you have far more options as to where and how you can place letters. It's also a good game for building intuition about concepts like the center of mass of an object.
This game can play out in very different manners, depending upon the structure of the tree that the players form, and the letters that they choose. With enough vowels in your tree, you may find that it is easy to make four- and five-letter words on every turn. If insufficient vowels are available, players may at times struggle to form any words at all.
If someone accidentally knocks down the tree, that player loses three points, and a new tree is started on the next play. Play continues until someone scores 20 points.
This game is basically exactly as cool as it looks, so if you think it might be your kind of game, you will probably enjoy it. Click here to see the reviews of others and buy it at Amazon.