From the developer:
5-6 Player Expansion to Noueni. You need the base game to play.
Noueni - Japanese for "On top of" describes this abstract game.
In Noueni each player has their own unique deck of 18 cards. Each card is broken up into two halves and each half has a scoring orb on it. The goal of the game is to have the most visible scoring orbs.
Laying new cards follow a simple set of rules:
1) Connectors on connecting edges must match in number (0, 1, 2, or 3 lines.)
2) New tiles can be placed next to a tile, or overlapping one half of other tiles.
3) A tile may not completely cover another fully exposed tile.
Just because the rules are simple doesn't mean that finding the best place to put a tile to cover up your opponent’s orbs and protect your own is easy.
Make sure you end up on top.