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Metal tiles are square, gray metal slabs. They all have four darker grey screws on their visible side.
Metal tiles cannot be burrowed under by sandworms and therefore is safe ground when the sandworms are underneath the ground. Other than that, metal tiles are normal areas that the player and enemies can walk on.
A group of metal tiles as seen in the level 4 of Bad Ice-Cream 3. Strangely, the bolts of the top-left tile of the center part are off-center.