A small list, but here goes:

• Bearenstain Bears Camping Adventure
  
• Caesar's Palace
  
• Mortal Kombat
  
• NBA Jam
  
• Pac-Man
  
• Poker Face Paul's Blackjack
  
• Poker Face Paul's Gin
  
• Ren & Stimpy: Quest for the Shaven Yak
  
• Ristar
  
• Sonic 2
  
• Super Columns
  
• Taz-Mania
  
• Tesserae
  
• Woody Pop
  

Would anyone else like to share their Game Gear collection list?