Listen to the sound clip 55. The Unknown World (Stage 1 alt. route ~ Core Facility, UFO Interior Passage 1) from METAL SLUG COMPLETE SOUND BOX メタルスラッグ ～コンプリートサウンドBOX～ Disc 1: Metal Slug Disc 2: Metal Slug 2 Disc 3: Metal Slug X Disc 4: Metal Slug 3 Disc 5: Metal Slug 4 Disc 6: Metal S...:
55. The Unknown World (Stage 1 alt. route ~ Core Facility, UFO Interior Passage 1)
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