  A player plays a game by sending messages into the game world using an
interaction technique. These messages are then translated into actions
performed on or by game objects towards achieving the game's objectives. A
game's interaction model is the bridge between the player's interaction and its
in-game actions by defining what the player may and may not act upon at any
given moment. This makes the choice of interaction technique, its associated
actions, and interaction model critical for designing games that are engaging,
immersive, and intuitive to play. This paper presents a study focused on
One-Touch-Gesture mobile games, with the aim of identifying the touch gestures
used in popular games of this type, the types of in-game actions associated
with these gestures, and the interaction models used by these games. The study
was conducted by reviewing 77 of the most popular games in the last two years
through playtesting by two researchers. The results of the study contribute to
existing knowledge by providing an insight into the interactions and actions of
popular 1TG games and providing a guide to aid in developing games of the type.
