Lake Cemetery is a Venture Missions level in LEGO Dimensions.
Section 1: Grave Danger
The Jacob Knights decide to go to the cryptic Lake Cemetery, a graveyard in attempts of finding the legendary Cannibal Head. Start your effort in this stage by clearing the small ledge where you begin of debris. That should provide a clear view of the target that is positioned in the corner toward the left. Fire on it and you will cause ledges to rise from the water to the right. Before you cross along those you can head down the narrow passage with the rising and falling saw blades, if you like. You will get valuable LEGO pieces there if you do. Otherwise, go ahead and cross the water toward the right.
When you reach the far side of the pond, you are on a small isle. Hop from there to a moving platform and ride that to the far right wall. Clear away any trash there and look toward the left. There is a Cannibal waiting on that ledge. Fire at him with Scottie's gun to eliminate him, then hop across and flip the switch to activate a platform toward the left.
Now you should hop back over to where you first arrived at the far right wall. Head back down toward the screen and look to the left. There's a Cannibal there, on the opposite side of a gap that you can cross by swinging from a dangling rope. Cross over, take care of the Cannibal, then grab a blade from the chest. Now head back down and to the area where you first caused the three pedestals to start rising from the water. Look toward the back wall where you activated the most recent pedestal and you will notice places where you can throw spikes. There are two such spots, so make sure that you hit each one with a spike. It will take many attempts, since the stone wall gets in the way even when all indications on-screen are that your throw should connect.
Once the arrows are properly placed, swim over to that platform's base and let the pedestal carry you up to dry ground. Hop up the wall using the darts and you will arrive on the high ledge. Look to the left and there is another Cannibal. Drop down and kill him, then look further left. You should see a ledge with the Cannibal Head. Use Tyler to dig at the sparkling point in the ground to unearth LEGO pieces. Now assemble them to form a tile. Shove the brown container left all the way along that tile, then jump onto it and from there leap across to the ledge where the head awaits you. Grab it to clear the stage.