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James Pond 3: Lost Levels!
By GambierBae :
This modification swaps out the game’s first two levels for two unused levels imported from the Amiga AGA version of the game. These are known by their filenames as SLIMEP06 and SCAVEJ02. The former appears to have been used in the game before being replaced with the Lair of the Mush-Beast boss battle, based on left-over data found in the ROM. There’s no indication as to where the other map would have been used.