Emeraldia

A puzzle arcade game released by Namco in 1993 only in Japan; it runs on the company's NA-1 hardware, and was the eighth game from them to allow scores not ending in "0" as well as the third of this type that did not use a Yamaha YM2151 for its music.

This game has three modes of play; Adventure, Normal and Versus. In all three modes, the players must line up blocks of a particular colour - and when three blocks have been lined up (vertically), they will crack. Once a fourth block of that same colour lands on the three cracked ones, they'll all shatter; for Adventure Mode, the object is to get the trapped sea creatures down to the bottom of the screen.