Tetris (1988) was a Tengen release, not a Code Masters release.
"Glass Tiger for life!
There are many U.S. releases without an official Nintendo license. Check out all the Code Master releases like "Dizzy The Adventurer", "Micro Machines", and "Tetris (1988)". If you're wondering why U.S. unlicensed games aren't more popular though, two words will answer that: "Action 52".