This copy of Tetris was bundled in with a couple of other games I bought. It has a sticker on the back with a few cheat codes. Anybody remember the GameGenie system? :
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How to Use Gameshark Codes on Visualboy Advance (with Pictures)
How to Use Gameshark Codes on Visualboy Advance (with Pictures)
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Just found Pokemon TCG GameShark codes. I will be trying them out later. : r/Gameboy
GameShark Game Boy Advance Codes - www.asshodriyah9.com
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The Story Of The Game Genie, The Cheat Device Nintendo Tried (And Failed) To Kill | Nintendo Life
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Amazon.com: GameShark for Game Boy Color & Game Boy Pocket : Video Games
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GameShark Game Codes for GameBoy Advance and SP : Mad Catz : Free Download, Borrow, and Streaming : Internet Archive
The Most Used Pokemon Emerald Cheats [including GameShark]
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GameShark for Windows 95/98 PC Code Browser CD-ROM for GameBoy GameShark | eBay