Em,just a question,but did you acitvate cheats before you started the minigame,or as soon as you started it ,as the cheats might work if you activate them before you go to the plant .Tho if that doesnt wrok,then it might acctaully be a pesky bug,tho i did try these cheats before, and they did work for me,so idk :P(tho i am playing on the pc donwladabel version off the game,so the problem might be exlusive to the browser version of the game(tho as i said before,idk).