Fig. 2

Competitive, Co-active and Collaborative game modes, from left to right. Each player controls a ring (yellow or pink) to catch balls of different colors (the center of the ring shows the color of the last ball caught). The screen displays on the top the remaining time and on the bottom the name of the players and their respective score (matching the color attributed to each player). In the Competitive mode, players compete for the balls, in the Co-active mode players can catch any ball for a combined score, and in the Collaborative mode, when one of the participants catches a ball of a given color (eg. green), then the other player can only catch a ball of the same color (green). For this mode, when scoring, a line between the two rings is formed to give feedback that players succeeded