Hello, im 17 years old and studying Mechanical engineering an i started thinking of creating some sort of game ( a bit boring) where children have to grab different coloured balls from a tank of water, i was wondering how to create a dispensing system to allow balls from a dispenser in which they are in air, to be inputed by gravity, into a container which can be filled with air or water, once filled with water, a door leading to a water tank will be opened and the ball will rise to the top of the open tank to be picked out of. (picture Attached) Sorry for the poor quality, but it should help convey my message. This multi atmosphere container, atmosphere will be changed by two other smaller contanairs equal or grater than the 2- way container, which one will hold air and the other will hold water. These will hydraulicly suck or fill this 2- atmosphere container, with eaither water or air depending on whether the ball is ready to be dispensed or resetting the system. At the start the 2-A-container, will be filled with air to allow the ball to go in it. Then the door conecting to the dispenser will close. Then teh container filled with water, will fill the 2-A-C with water, therefore the other container will be holding this air. Then the door conecting to the main tank will be opened and the ball released to the tank and will float to the surface. Then the door will close. The container which recently held the water in it and now empty, will then suck the water out of the 2-A-C and return it full of air for the process to repeat. I would prefer all the mechanisms to be electrical from the , dispenser, doors, and containers which suck and input the air/water into the 2-A-C What I am asking for is, to tell me whether or not this will work, limitations in this design and any improvments or alternatives. Thanks for reading, and i will be gratful for any comments.