File:LudusScope-Accessible-Interactive-Smartphone-Microscopy-for-Life-Science-Education-pone.0162602.s013.ogv

English: Euglena soccer game. In this single-player game the player needs to score points by dribbling or shooting a ball into the goal. The virtual ball is controlled by a Euglena cell, which is tracked. The player tries to orient the Euglena via the joystick controlling the 4 LEDs. The player may wait until a cell swims “through” the ball to pick it up, or tap with the finger on a Euglena onscreen to pick up the ball there. By tapping the “Shoot Ball” button, the ball is shot a long distance in the direction of the current Euglena orientation. Carrying or shooting the ball into the goal scores 5 points. Tapping to select cost 1 point. The scoring goal switches sides every 30 seconds to prevent that all Euglena end up on just one side. These two different game modes to select the ball (and parameters therein) can be used to significantly alter the challenge and duration of the game. Note scale bar, real-time velocity, and enlarged display of tracked Euglena to naturally emphasize relevant biology content during the game play. Euglena are approx. 50–80 micrometer in length. Speed is real-time.