This is on level 2-5. If you need to unlock this level, you can find the map in level 2-3.
Level 2-3 (Map):
LUDUL RDRDL DRUUR
Level 2-5 (Artifact 3):
UURDD DDLDL DLDLU RDRDR DLDLD LDRLU RURUR URURU RDDDR DDLD
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