Program a bot to clear all the snow from the circle.
It must start out of the circle, then never completely leave.
The bot must fit in the bot box.
It is to use light sensor readings.
The bot must turn off in 45 seconds.
Number one: Have some one ready to catch bot just in case.
The big truck at the LEGO City is not safe - one day I forgot to turn
it off
and no one was there to chatch it before it fell off the table.
Some designs and programs that repeated the same turn would just keep
a piece and not push it off.