I am not sure why Some players are getting stuck on the button tbh you just collide the character eith it and the cage opens! :) but there are 2 buttons one closes the cage other opens it. To collect the key you just have to walk right to it and done :D. But thank you for playing I really appreciate it I plan on making a longer and more complete and clean version of this game the entire art work was made in one day on a Galaxy Note (the one released in 2011 it lags like holy hell lol and is not precise like a wacom) thank you for playing!!