This game was developed in collaboration with the NEC CCII laboratory (http://www.nec.com/en/global/rd/labs/ccii/index.html) with a grand from the JSPS (http://www.jsps.go.jp/english/).


“The game Kokochi is both a collaborative and competitive game experience. The background story tells about a cherry blossom tree that once blossomed throughout the whole year and kept the community of the players save from evil. But because the people living in the community stopped to share their emotional state with each other the tree withered and lost it protective power. The one player that helps most to restore the power of the tree gains a free wish from him (see also the corresponding comic strip).

So the main goal of Kokochi is to help the communities cherry blossom tree to fully blossom again. The players can achieve this goal by successfully performing a ritual with at least one other player in the game. In order to perform a successful ritual at least one of the collaborative players has to have a specific combination of emotions that is unknown to them before they start a ritual. The game ends when the last of four blossom states is reached – Figure 2 shows all possible blossom states of the cherry blossom tree in the game.


The second goal for the players is to have the most Flower Points (FPs) when the cherry blossom tree reaches its fourth blossom state. A player gains FPs by stating emotions (2 FPs) by getting hugged by other players (4 FPs) and by successfully per-forming rituals with other players (10 + 5 FPs for every emotion of a player that is used to fulfill the required emotion combination).

Note that the game features two kinds of scores for both goals. The community score keeps track of the progress of all players in the game – the collaborative game part – and the FPs keep track of the progress of an individual player. The game itself is realized as a HTM5 web-application and therefore runs on any kind of mobile device.” (1)

You can see the game in action at and the result of a played game at


(1) Matyas, S., Daishi, K., Takao, S., Kazuo, K., and Keiji Y. (2012), Game- based Trust, In: Entertainment Computing ICEC 2012 (Bremen, Germany), Lecture Notes in Computer Science, Springer Berlin/Heidelberg.

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