here is what seems to be a sliding puzzle but once you move the right panel your prize awaits
Step 1: The Tiles.
for this you will need 8 4x4 studded plates and 8 2x2 smooth or one studed plate. you will also need pieces for boardering the 2x2s.
Step 2: The Tile Base
im fairly certain that you can figure this out easily but for the part with the whole in it, well see the next step.
Step 3: The Part With the Hole in It.
this should be a fairly simple step.
Step 4: Setting It Up.
this step depends on what you want your friend, sibling, or whoever it is, to find. for this im using a lego barrel. hope you enjoy.