I will skip the reply as others have made the points I generally would have made.
Isn't Tetris: The Grand Master a legit title?
https://en.wikipedia.org/wiki/Tetris:_The_Grand_Master
I understood Lockjaw was the ultimate homebrew DS Tetris game (assuming you can still find it, and you probably can).
Because the Omega is crazy expensive? Then again, I suppose a DSTwo is also crazy expensive these days.
For the sake of others playing along at home
Yes it is an original game, and considered one of the best versions going (albeit you might meet Japanese tetris vs not debate here).
Tetris Grand Masters 3 (arguably the definitive version both then and maybe even now) was however remade (in spectacular fashion) as homebrew on the DS by a Japanese homebrew dev called meraman (if you have played anything else by him it was likely some of the music homebrews
https://www.gamebrew.org/wiki/NDS_BGMFILER ). It saw a cease and desist though so became quite hard to find
http://web.archive.org/web/20080908083911/http://meraman.dip.jp/index.php?NDS_TGM has some info, easy enough to find these days.
It along with Tepples' lockjaw/tetnus on drugs, which had some flavour of legal woes* of its own (so more archive links
https://web.archive.org/web/20120311175439/http://www.pineight.com/lj/dl https://web.archive.org/web/20120204045854/http://pineight.com/tod/ ), represent what many would consider the two best homebrew takes on Tetris, and the hardcore tetris set does get rather specific (
https://harddrop.com/wiki/Drop#Gravity for but one aspect). Indeed "best homebrew" might be a category but they also arguably beat out both DS commercial efforts (TetrisDS and Tetris Party Deluxe/Tetris Party Premium), though I actually quite like TetrisDS (after
https://gbatemp.net/threads/tetris-sound-hack.36870/ I have many hundreds of hours playing vs cpu mode) where I find party feels like mush (even more so than the otherwise interesting PSP versions which suffered for the controls... should try that out on an emulator now).
Lockjaw/tetnus on drugs was also on the GBA and handily beats out baseline Tetris worlds (there is a hidden mode that plays more like classic tetris and is pretty good -- "Popular Mode, On select screen and Marathon Mode highlighted Hold L, press Select") which is what the English speaking world got for the GBA, the Japanese also got Tetris Advance aka minna no soft tetris and that is really good (so much so I actually own a copy and paid handsomely for it).
*don't think any directly other than maybe the rename but tetris company vs world of homebrew/open source is a different discussion (
https://news.slashdot.org/story/08/02/26/1859249/tetris-creator-claims-foss-destroys-the-market ), though there is a reason you will see it dubbed tetromino stacking game by many.