teams compete to have most 'lights' (cards with on/off written on them) switched on or off at end of time limit
30 cards with on written on one side and off written on the other, timer
30 card squares with "off" written on one side and "on" on the other side. split the beavers into two teams and spread cards out on floor. one team trys to turn all the cards so the say "on" (switching all the lights on) while one team turns them to say "off" (turning all the lights off). the winning team is the teavm who has the most lights on/off at end of time limit.