Hai Noon is a card driven game, where the players are divers trying to avoid getting attacked by the surrounding sharks.

Both, the divers and sharks are represented by doublesided tiles that form the play area. For all player counts the setup is identical. There is a four by four grid of tiles with the divers on the four center spots and the sharks on the outside. For the basic game only the four sharks in the corners are hungry (hungry side face up). In turn order players place cards to either move the divers, the sharks or the shark cage. The cards come in four color variants - on each side of the grid only cards of the same color can be played. In the beginning you can place any color on any side. Later on, if a color is already present at one side, cards of the same color must be played on that side. If the third card is placed on a side, the sharks on that side attack. Unless a player is protected by a shark cage or by playing a harpoon as a reaction, the shark succeeds. If this is the first successful attack, the diver tile is flipped. If it is already flipped, this player loses and all the other players - and the sharks - win.

—description from the publisher