Grow Metallix Mega Gro-Bot ~ Purple ~ 600% Growing Robot ~ Gag Toy ~ Water Expandable Toy Simple, Silly, No Mess! ~ No real work needed, just patience. Simply place in container filled with water, wait, & wait, and wait, wait some more, wait a little longer....Takes 3 days to see effects, keep adding water and waiting.... Find something FUN to do.... Make sure container has plenty of room for growing robot...don't watch the robot while waiting or it will slow down nearly to a stop..... After approximately one week, your robot will have grown about 600% & be absolutely useless. This is the gift you give to the child who's parents bought your child a repetitive CD, messy art kit, or makeup. (To be gifted with humor only) it's the gift children never let you throw away.