Although EV3 can still be used for soccer the new Spike Prime sensors are far superior making the EV3 uncompetitive as a striker. The EV3 with infrared sensor works quite well as a goalie.
Robots can easily be tipped over so build them so they have a low centre of gravity.
Include a Infrared Sensor. Compass Sensor is not required for Simple Simon.
The robot must be a maximum of 1kg and fit within a 22cm cylinder size limit.
Goalie robots should be built in a manner that the cross bar prevents them from going behind the goal line.
The ball cannot be held underneath a robot, i.e. no part of a robot can protrude over more 30 mm of the ball’s projected diameter.
The use of a rotating drum or wheel that imparts dynamic backspin on the ball to keep the ball on its surface, called a "dribbler", is not allowed. Flippers are also not allowed.