Free the Key


Hint: Using something other than the wooden box to cover the yellow button. You need to save the wooden box for something else.

Full Solution:


First, open the green gate with the steel box (red circle). Use the refelctors to destroy guide the cannonfire toward the Z-Bots guarding the second steel box (blue circle). Use this second steel box to activate the yellow button to open the yellow gate.After you open the yellow gate, enter it and you will be taken through the underground passage to get the key. From there, go south to push the hidden wooden box into the water so that you can cross the moat. You will need to free the Kaboom (it'll stop the conveyor for you) so that you can get back to the north side of the level. Now push the wooden box from the top of the level (by the palm tree) down to the bottom of the level and create a bridge (green arrow) so that you can get to the red button. Press the red button, avoid the Zbots, and make your way to the Exit.