LEGO Island 2: The Brickster's Revenge (Game Boy Color)

LEGO Island 2, on the go. This version is a little on the shabby side, gameplay-wise.

Build Date
The US and European ROMs have the same build date, located at ROM address (US) and  (Europe): 23/01/01

From this, it seems both versions were built on January 23, 2001.