Allspark Search
Allspark is the talisman that allows unlimited power to whomever has it in his possession. Create a small grey cube to resemble the Allspark, and hide it around the party area. Tell the party guests the Allspark is hidden and one of them must find it to win a prize. On "go," let all the children run around to try to find the Allspark. The child who finds it wins a prize.
Transformers Battlefield
Create two identical obstacles courses in the back yard. Use ropes stretched from tree to tree to climb under, add boards to jump over, and place tires or hula-hoops to hop through on the obstacle course. Divide the players into two teams, and tell one team they are the Autobots and the other team is the Decepticons. Teams line up at a starting line, which is about 10 feet away from the course. On "go," the first player in line runs through the obstacle course and back to tag the next person in line. He then runs through the course. The first team to have all their players finish the course wins the game.
Decepticon Bowling
Tape pictures of Decepticons on empty plastic 2-liter soda bottles. Stack the bottles in a pyramid like bowling pins. Have all players line up at a line about 10 feet from the bottles. Give each player a rubber ball and let him try to knock down as many pins as he can. Let each player roll the ball five times. The player who knocks down the most pins in five turns wins the game.
Transformers Pass
Get a plush or toy Transformers and have all party guests sit in a circle. Hand one child the plush Transformers and tell him to pass it around the circle. Play music while the children pass the toy around the circle. When the music stops, the child holding the plush toy is out of the game. The last player left in the game wins the toy.
Robot Building
Use a table to put things like duct tape, empty CD cases, foil, plastic wrap, old computer chips, plumbing parts and old-printer cartridges. Let each child build a robot out of the supplies on the table. Award prizes to the best, silliest, funniest and scariest robot.