Petris

Petris – A puzzle game of shapely pets for the Game Boy Color (CGB) / Sega Game Gear / Analogue Pocket

Build your favorite pets in all shapes and sizes, keep ahead of dropping pieces and make it to the next level.

Long Pet – Complete progressively longer pets to reach the next level
Tails Cleanup – Clear all tails off the screen per level
Crunch-up – Keep ahead as the screen crunches upward and new pets appear
Level Up – Classic level-up style
Marathon – For the long distance player
Difficulty levels for all players, from relaxing to full-tilt speed:

Easy / Normal / Hard / Expert / Beast
On real hardware and emulators you can play 2-Player link vs mode for any level (Crunch-up recommended).

Source: TheGamesDB