State-of-the-Art: Semantics Acquisition Games - Semantic Acquisition Games: Harnessing Manpower for Creating Semantics - page 43

SpotTheLink game, which is the last game in their chain of SAGs oriented on building
of a commercially usable ontology [ 18 ]. Their SAGs “ontologize”Wikipedia through
game OntoPronto and annotate Youtube videos (annotation game OntoTube ) and
Ebay offers (annotation game OntoBay ). The SpotTheLink game is used to connect
these acquired metadata to other existing ontologies.
The game principle of the SpotTheLink is as follows: The player is presented with
a concept (class) of one ontology, and a hierarchical structure of another ontology
where he has to identify the most suitable concept (class) and link it to the given
concept with one of the predefined predicates. The more specific the predicate is, the
more points he receives. The game is played by two players simultaneously, so their
actions can be immediately evaluated (they have to agree). The challenging element
for the players is to find a proper path in the ontology tree: they cannot see the whole
tree at once, as it is too large, so they have to navigate according to descriptions of
general classes (close to the root) in order to reach the more specific ones. As a by
product, the quality of such class descriptions could be evaluated by analysis of the
“click streams” through the tree (e.g., if the player seems to be lost in the structure,
the descriptions are probably not accurate).
3.4.5 Categorilla, Categodzilla and Free Association
Next SAGs for ontology building we analyze, are the games Categorilla , Cate-
godzilla and Free association , created by Vickrey et al. [ 21 ]. They do not work
with heavyweight ontologies, but collect only couples of terms related hierarchically
(Categorilla) or being in free, unnamed relationships (Categodzilla). Authors cre-
ated these games with reference to two existing, real-life games—Scattegories™and
Taboo™, assuming it will gain them some popularity (which is a interesting notion
for design of the SAGs in general).
The game dynamics of the Categorilla and Categodzilla work as follows: two
players collaborate and have to agree on the same output (similarly to the ESP
Game [ 24 ]). Both players are given a category (concept) to which they have to
match-on some subclass starting with a particular letter (e.g. for the category “bird”
starting with the letter “k” the players may agree on “kookaburra”). They may enter
as many words as they want, and they do not see the other player's guesses. In
case of Categodzilla players type words in three separate columns (for which they
are differently scored too), the first one is free word (starting with any letter), the
second contains words starting with a particular “easy” letter (i.e. one that is more
frequent starting letter in the language, like “c”) and the third words starting with
some “harder” letter (e.g., “k”).
The Free Association game works similarly than games above, but with a differ-
ence: the players can type words that are in any relationship with the given word.
They are only constrained with a set of banned words which exists to each “task”
word, produced from the previous guesses. This forces players to type in words that