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Find an Anti-Cube.
Find your very first cube shard.
Find ALL collectibles.
Break the code.
Get to the end.
Collect all 32 Golden Cubes and 32 Anti-Cubes.
Find the Tome artifact.
Find the Skull artifact.
Find the Writing Cube artifact.
Find the Counting Cube artifact.
Reactivate all 5 warp gates.