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This is a sub-page of Pikmin 2/Unused Caves/last 4 Dungeon.

All floors in Last_4 are enemy test floors, some of them with layouts that don't appear anywhere else in the game.
Given the cave's file name, this would have appeared in the Wistful Wild during game development.

Floor #	Layout File	Enemies
Floor 1	units.txt Unused	Skitterleaf x10
Floor 2	units.txt Unused	Shearwig x9 21 enemies from the following list: Male Sheargrub (1/5) - min 8 Female Sheargrub (4/5) - min 8
Floor 3	units.txt Unused	15 enemies from the following list: Dwarf Red Bulborb (2/10) - min 3 Dwarf Orange Bulborb (3/10) - min 3 Snow Bulborb (5/10) - min 3
Floor 4	2_NARI_nor3_mid2_tsuchi.txt Unused	5 enemies from the following list: Dwarf Red Bulborb (1/3) - min 3 Orange Bulborb (1/3) - min 3 Snow Bulborb (1/3) - min 3
Floor 5	1_units_ike4_tsuchi.txt	Water Dumple x2 Wogpole x6
Floor 6	1_units_boss_tsuchi.txt	Beady Long Legs
Floor 7	all_units_water_tsuchi.txt Unused	10 enemies from the following list: Wollywog (1/2) - min 3 Yellow Wollywog (1/2) - min 3
Floor 8	all_units_water-ike4.txt Unused	Fiery Blowhog x4
Floor 9	2_units_cent_mid2_tsuchi.txt	Watery Blowhog x4
Floor 10	4_NARI_all_hitode.txt	Cloaking Burrow-nit x10
Floor 11	5_NARI_nor1_nor2_nor3_hit1_hit2_tsuchi.txt Unused	Burrowing Snagret x4
Floor 12	1_units_north_metal.txt	Antenna Beetle x2
Floor 13	1_units_north_metal.txt	Swooping Snitchbug x6
Floor 14	1_units_north_metal.txt	Bumbling Snitchbug x6
Floor 15	1_units_north_metal.txt	Careening Diribug x3
Floor 16	2_units_ari_nobo_metal.txt Unused	Puffy Blowhog x3 Withering Blowhog x3
Floor 17	2_units_ari_nobo_metal.txt Unused	Anode Beetle x10
Floor 18	2_units_cent_nor1_metal.txt Unused	Fiery Bulblax x2
Floor 19	2_units_ari_nobo_metal.txt Unused	Spotty Bulbear x3
Floor 20	2_units_ari_nobo_metal.txt Unused	Armored Cannon Beetle Larva x6
Floor 21	1_units_houdai_metal.txt	Man-at-Legs x2
Floor 22	4_units_f_g_i_spiral_conc.txt Unused	Hermit Crawmad x10
Floor 23	1_MAT_manp_conc.txt Unused	Ranging Bloyster x3
Floor 24	4_units_a_b_c_d_conc.txt Unused	Giant Breadbug x2 Breadbug x3
Floor 25	5_units_pype_conc.txt Unused	Gatling Groink x4
Floor 26	1_MAT_manp_conc.txt Unused	Pileated Snagret x4
Floor 27	4_units_f_g_i_spiral_conc.txt Unused	Fiery Dweevil x2 Caustic Dweevil x2 Anode Dweevil x2 Munge Dweevil x2
Floor 28	1_units_manh_conc.txt	Raging Long Legs x2
Floor 29	3_units_f_g_m_conc.txt	Lesser Spotted Jellyfloat x3 Greater Spotted Jellyfloat x3
Floor 30	1_units_king_tsuchi.txt	Emperor Bulblax x3 Bomb Rock x6
Floor 31	1_units_boss_tsuchi.txt	Empress Bulblax
Floor 32	1_units_houdai_metal.txt	Titan Dweevil (NOTE: Crashes game)