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